Volts, Amps, and Watts Explained
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- čas přidán 24. 10. 2016
- What's the difference between a volt, amp, and watt? Why is your power bill in kilowatt-hours and your battery bank in milliamp-hours? Why are there so many units?!
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I watch this video every 3 months, just to make sure i don’t forget the topic.
It's been 3 months, have you watched it again?
@@gargonio4295 😠 my reminder was set for this weekend.
Its been 5 months have you watched it?
@@ludadoyt8317
I watched it instead of him
@@anasusz3815 very good
I think this explanation is a bit over-complicated... but can I do better? Here goes.
Volts (voltage) is kinda like water pressure.
Amps (current) is like how much water is flowing. Think current, as in the current flowing in a river.
Just like water, if there is no pressure, then the water won't flow.
If there is more _resistance_ (say, a river with many twists and turns, or a narrow water pipe), it will take more pressure to make the water flow. This is just the same as electrical resistance (which is measured in _ohms_).
Usually, if you have a source of electricity, it will be supplied at a certain voltage. Say, 120V or 240V. This voltage normally doesn't change much, regardless of what you plug in.
Depending on the _resistance_ of what you connect to it, a certain _current_ will flow. When you have both _voltage and current_, power is used. Power is measured in _watts_.
If you don't have anything plugged in, that is (more or less) a resistance of infinity. No current will flow. As you might guess, there is no power used.
If you short circuit your electricity supply, that's a very low resistance. Plenty of current will flow. Lots of power is used!
To carry lots of current, you will need thick copper in your wire. The electrons flow in the copper, so you need a thicker "pipe" if there is more flow.
If your supply is a high voltage, you will need thicker plastic insulation around the copper. Just like you need a thick walled pipe to keep lots of pressure from bursting out.
Perhaps you have a heater, which is 1,200 watts, or, 1.2 kilo-watts (kW). This is how much power it will use.
Of course, your electricity bill will be higher if you have your heater switched on for longer. If you run it for 10 hours, you will have used 10 times as much energy as if you ran it for 1 hour.
This is why energy is measured in kilowatt-hours (kWh). That is, the number of kilowatts of power used, multiplied by the number of hours it was used for. Running your 1.2 kW heater for 10 hours will consume 12 kWh.
The expression "kilowatts per hour" does not make any sense (unless there is something very, very special going on!).
Batteries are slightly unusual, as they are measured in how much current they can provide, for a certain amount of time. This is because of chemical reasons. So, your battery may be able to provide 2 amps for an hour. This is a 2 amp-hour battery.
If the battery voltage remained exactly the same, this would equate to a certain amount of kilowatt-hours, but sadly the battery voltage drops somewhat as it runs flat. This makes it more complicated, so amp-hours is the preferred unit of measure.
Now for some maths:
Voltage = Current x Resistance (V = I x R)
Power = Voltage x Current (P = V x I)
An example - your 120V, 1.2kW heater.
How much current is flowing? Put those numbers into the second equation.
P = V x I
1,200 = 120 x I
I = 10 amps. Easy!
What resistance is your heater? Put the numbers into the first equation.
V = I x R
120 = 10 x R
R = 12 ohms.
Let's plug your heater into 240V instead! How much current would it draw?
V = I x R
240 = I x 12
I = 20 amps. Twice as much!
How much power?
P = V x I
P = 240 x 20
P = 4,800 watts! That's four times as much! This may be a surprise. Your heater will certainly blow up.
Did I do better at explaining it? Please let me know!
Better thanks
This is noted. I will place this on my notes, really.
Godfrey Poon so current will be = how much electrons are flowing
+Yuvraj Dhruw Exactly.
Godfrey Poon Omg thanks I finally got it
as someone who failed chemistry, this answered about 4 questions and raised about 16
That is called learning. You didn't fail chemistry, your instructor failed to teach it so that you can understand it. If you retry chemistry today, I bet it will make more sense. Some things do not take hold in our youth. Retain enough learning and master it and you get to call it wisdom. Then you should dispense it, because it will do you no good to take it to your grave.
Thomas T He failed. He skipped class to go smoke weed with his little stoner buddies. I’ll give you the benefit of the doubt and say you are optimistic but you are also naive. Let this be a lesson to you. Don’t always assume the best.
MrL you’re an idiot 😂
@@thomast8539 This is a great quote, did you come up with this? If so, write a book on philosophy ASAP. TY
...wait isn't this physics?
Never thought I’d end up on a Linus video when trying to understand my uni coursework xD
Me rn
I can control the brightness of the light in my fridge depending on what setting my oven is running at... which is nice
ROFLMAO
Wtf Doofenshmirtz
@@mamad7976 hahahahahahahahhahahah I just woke up and watched this and read this. Watt a morning already.
Haha hah hahaha haha ya that must be nice!
Does it RGB?
Volts=Caliber
Amps=Firerate
Watts=DPS
AH=Magazine
WH=Total damage
BLOOGaming tl;dr
very helpful!!
Not the whole story. Higher voltage also causes higher current unless there is higher resistance.
@@dragongempeltus0122 uuuc
Resistance=thiccer flesh
As someone who is in the process of becoming a science teacher. This is one of those videos that will be saved and used in classes later on.
Hey...I wish you well and hope you enjoy your future endeavors. It is largely a thankless job, but great teachers (which is what I think you'll be due to your concern and purpose well before it's becoming a reality) are what help develop children with less than stellar parenting into upstanding citizens in the future. I just hope some of these strange political stuff is toned down in the classrooms, especially for the youngsters.
One misconception I'd correct here is thinking of the cell (or battery) as a reservoir of electrons ready to flow from negative to positive. It's not that. It's more like a pump, which pushes the electrons that are already in the wires and components around. The model I use is to have students hold a loop of rope, and one of them pulls the rope through their hands. That person is just a pump - they don't have a big reel of rope in their pocket.
I have watched a few videos on this subject and was always confused. This finally cleared it up.
One more analogy incase someone needs it.
If you think of a can of hairspray, volts would be the pressure in the can
If you press the nozzle down, the amps(current) would be the measure of how fast the hair spray comes out
Watts would be a measure of how much hairspray was used in total
thank you!
This is great!
As an Electrical Engineer, great job! Would've been so much easier to understand this concept with this video many many years ago
thought it flowed from positive to negative. not negative to positive.
@@ortegajones4929 positive to negative is what's called "conventional current", which was the original theory of how electricity flows. This was later discovered to not be true (it flows from negative to positive), but many people still teach and use conventional current for circuits and such, mostly because it was already pretty well established and would be hard to change
@@user-ij7xq5uj3d I did research it right after but thanks for the attention :). Considering electrons are negative I don't know why I missed that.
@@user-ij7xq5uj3d Yeah, now, I am being taught that current flows from POSITIVE to NEGATIVE. Electrons flow from NEGATIVE to POSITIVE.
@@ortegajones4929 amazing how you couldn't accept being viewed as ignorant.. your reply is more embarrassing than the idea of you ignoring that electricity fact.
That last bit though. First time I've ever seen an off-shoot in a techquickie. And it was GOLDEN!
everyone is discussing whether or not well explained, and I was just looking for someone like me how enjoy the off-shoot in this video thanks Carsten Svendsen
And it had an Americaball!
Carsten Svendsen there were more ;p
Carsten Svendsen Awesome!!!
In physics terms:
Electricity is measured in units of charge
Voltage(V)=how much energy per charge
Amp(I)=how much charge per time
Wattage(P)=how much energy per time
Therefore P=V×I
Imagine electrons as trucks carrying energy.
High voltage means each truck carries a lot of energy.
High ampere count (current) means many truck passes through.
I love that you made me smile while learning! That’s the best way for me personally to retain things. Connecting humor and lightheartedness with practical application is a clever and effective way to teach. Well done!
wait, so US also uses kilowatt hours? But.. but that's dirty metric system! I thought they have something like 3 arm lengths of electricity, or something along those lines, they used to measure things in body parts.
One shock = the amount of electricity needed to kill a 240-lb. person
@@infinitasalo472 0.05A AKA 50mA Is enough to kill someone
Well, a kilowatt-hour is just the same thing as a joule, so it's still stupid
Feet and mile were first used by the British many fortnights ago, you european Sap.
Metric is better than you're stinky feet smelling Imperial system Canada all the way!!
Been in school for 22 years and this is - by far - the best explanation of volts vs amps that I have heard. Thank you.
22 years ?
Bruh wtf is your major?
What the fuck are you talking about it's so you saying you went through high school two times first grade the fucking 12 twice damn bitch you crazy
Did you reset 3rd grade 5 times and then reset middle school twice?
It’s simple if you just picture a river flowing. Very basic electrical knowledge that everyone should know
Linus I've been following your channel for a while. I've watched many youtube channels trying to understand the concepts of voltage and amps. Some of them even used the water analogy. I almost gave up trying, until I saw your video. There's something about hearing it from the right person that makes it click on a persons brain. Thank you so much!
Not gonna lie, this was hella confusing ahaha 😂. So many analogies, I just wanted to know what each thing actual represents.
As an engineer, I feel like it's the simplest way. The water pipe vs electrical wire analysis is the simplest way to visualize it.
My teachers did a poor job to get me interested in stuff i guess. Thank you Linus , Guru.
The reason why it is called KiloWattHours, is because when you multiply two things together you will have to multiply the units as well, like how you do with the area, 10m * 5m = 50m^2. So if your device is running 1k Watt (per hour), and you used it for 24 hours. 1k Watt * 24 h = 24kWatt * h. That is why we have to keep the hour included, else you wouldnt have known whether that number is your total usage or just a usage on a specific period. Hope it helps
I know this comment is 4 years old, but I think I'm either still slightly confused, or *maybe* I understand what you're saying. So originally (after watching the video) I was thinking a "Oh, so a kWh is the average amount of kilowatts you're using per hour over the course of a given period of time." (in the case of an electric bill: 1 month). However after reading your comment it sounds like I was woefully off the mark. -_-
Linus had also mentioned that "Light Years: Not Time", and while he's technically correct (Light Years are a measure of distance), it's also not wrong to consider it in the context of time (i.e. "If I were moving at the speed of light, it would take me this many years to travel from Point A to Point B"). Using this mental framework when trying to understand your comment, are you saying that a Kilowatt-hour is actually summarizing "If you were continuously and precisely using 1 Kilowatt of power per hour [during this billing cycle] this is how many hours total you would have been running your power"?
@@TutorialsForMom Let's take some concrete examples. For a total of 24kWh to be used, one could either use 1kW for 24 hours, 24kW for 1 hour, 12kW for 2 hours, or any combination of factors that multiply into 24. In this particular case, there are only 2 factors--one being power (watts / kilowatts) and the second being the duration for which it is used (hours).
A kilowatt-hour is not a summary of what you mention in your comment. Rather, in this context, it is simply a unit of total energy consumption. However, since [kW x h] = kWh, knowing any two values in the equation will allow you to easily calculate for the third. Hope this helps
great scotts!
@@shootinbruin3614 Aha! Okay - very much, yes! Having it expressed in terms of "an equation with known and unknown variables" was incredibly helpful. Thank you!
@@TutorialsForMom Glad I could help!
Holy shit, not the tunnelbear ad sellout 😱 what a throwback
Wow this answered so many questions!!! Studying solar power batteries and voltage with amps and everything I am usually left with more questions than answers! This is probably one of the first videos I have ever watched or I did not feel like I was left with more questions! Thank you so much and please teach me more!
Monaco runs on 230V, New York runs on 110V → definitely no blue smoke, it will just run very slowly (if at all).
It will run just fine, it will just use more amps
@@paulopereira47 That is not how hair dryers work.
hellterminator not really how most electronics works anyways iirc.
@@dryagedmilk It kinda is, actually. A lot of electronic devices these days have switching supplies which can accommodate a wide variety of input voltages and will always draw the same power (allowing small differences due to conversion efficiency). So for something like a computer, he's right - it would “just use more amps.”
ruined it
...but the voltage in Monaco is 230V, and in New York it's 120V, so if you plug in that hairdryer in NY it will run at half the voltage, so it' won't explode, but will blow air at a slower speed... which you explain when you compare Power and Amperage. Blame the editor
thought i was the only one that noticed this. the other way around and it would have been right tho :)
But 110V sucks. #EuropeRocks
Interestingly, to run a 1000W US hair drier (110V) you require double the current that is required for 1000W European (230V) hair drier, which explains why the cabling is a lot thicker on US goods, as the cable needs to be able to carry the higher current. Power = Voltage x Current
Im mexicancholo but I side with the viet cong and I have one of those rice hats
And I also consider myself a ricer
I am about 30 years old,
This is the first time i am coming across a person who has explained these units in such simple terms.
I wish i had seen this in my school days.
Better late than never
After 42 years I finally understands the difference between, Amps, Volts and Watts, Thank you Boss
Thx Linus as always you seem to have a natural way of explaining things. Now i can move on to more advanced subject matter.
This taught me more then my 9 week electrical course
your electrical course must've been exceptionally bad.
@Rio Pruitt I think it's like that in all trades or jobs you go to school for. They push so much info out at you in college or trade school and you forget a lot of it by the next semester. You'll eventually get it on the job like most things. People will still be showing you and teaching you if you have questions about something and eventually it will all make sense. I still have a hard time with all this in welding and get it so confused still on my welding machine. I know how to weld, but it helps if you know exactly what voltage and amps does cause then you can tweak it just right to make a perfect weld. Something else I haven't got yet and I don't think anyone in my college did was blueprint reading. I think one reason is because our first teacher never really taught it and in the second class he gave us blueprints that seemed really advanced to learn from. They were like huge pages with many parts and about 7 pages to each one. It was overwhelming. They push each thing you learn so fast that it still doesn't make much sense by the end. Knowing about half or more than half of it is better than knowing none of it. It makes it easier to learn on the job.
You must not pay attention at allå
Why did my teachers not explain all those units and relationship between them like this man.... Genius analogy explanation. Finally understood this after 13 years during 5 minutes...
Thank you so much! I needed some starter knowledge before I decide if I want to take a class and dive further, but I couldnt find anything I could understand. This is exactly what I needed to get me interested in electricity as I can actually grasp this!!! Thank you!!!
Linus, I love you. Back then, people would mock me for wanting you explaining this volt, amperes and watts. But you have granted my wish. in short; thank you.
the best self-deprecating humor, you just don't see it coming, hilarious!
My light just turned on for the first time. I'm married to an electrician and this is the best I have ever heard. Now I can talk like him and I want my EFI plugs back and a sine wave power control to hook up my telescope and computer. Im sure you get this. No more watts for me . I need to see my currents at play and know if I'm rated in all areas to safely protect my 6,000. Equipment. Your the best.
Second rate youtubers? You guys explains thing thats complicates me for years much more simpler and yet thoroughly than my instructor..great job!
Thanks a ton, I was having a hard time wrapping my head around some of these terms and there's so many it can be confusing as to which means what but you were able to explain it in a way I could picture better
perhaps you could do a video expounding on the subtle differences between what the VA and W ratings on PDU’s, USP’s, etc and the implications they have on switching power supplies commonly used with said power distribution devices.
Explained nicely. Love the Serenity on the back of the door at 6:01!
Concise and simple analogies are used to understand. I just wish more videos were like this!
Great Video.
Manually working out Consumption
Calculating the energy cost of an appliance or electronic device is fairly easy. Most devices have a label that lists how many watts it uses, either on the device or in the owner's manual. You will need to find this number to figure out how much the appliance is costing you. You will also need to estimate how many hours a day you use a particular appliance.
The Wattage Label
If you can't find the wattage label, there are other options to determine how much power your device uses. For example, you can purchase a wattage measuring device, such as the Kill A Watt®. Simply plug your appliance or electronic device into the Kill A Watt® to determine how much power it uses. Or you can contact the manufacturer, with your model number, to find out how many watts a particular device consumes. You can also check the list at the bottom of the page for common wattage on household devices. Though your particular device may vary, it should give you a rough estimate of the energy expenses related to the device.
Calculate Electricity Consumption - 4 Easy Steps
Step 01 Watts Per Day
To calculate energy consumption costs, simply multiply the unit's wattage by the number of hours you use it to find the number of watt-hours consumed each day. For example, let's say you use a 125 watt television for three hours per day. By multiplying the wattage by the number of hours used per day, we find that you are using 375 watt-hours per day.
125 watts X 3 hours = 375 watt-hours per day
Step 02 Convert to Kilowatts
Electricity is measure in kilowatt hours on your electricity bill. Since we know that 1 kilowatt is equal to 1,000 watts, calculating how many kWh a particular device uses is as easy as dividing by 1,000.
375 watt-hours per day / 1000 = 0.375 kWh per day
Step 03 Usage Over a Month Period
Now to find out how much that's actually going to cost you on your electric bill, you'll have to take the equation a bit further. First you'll need to figure out how many kWh the TV uses per month.
375 watt-hours per day X 30 days = 11.25 kWh per month
Step 04 Figuring Out the Cost
Next, pull out your last electric bill and see how much you pay per kWh. For this example, let's say you pay 10 cents per kilowatt hour. To find how much the TV is costing you in a month, multiply your electricity rate by the kWh per month that you calculated above.
11.25 kWh per month X 0.10 per kWh = 1.13 per month
Another Example
Here's another more costly example: Your refrigerator runs 24 hours a day. Most refrigerators consume 300-780 watts of electricity. Let's assume you bought a model that uses only 300 watts.
300 watts X 24 hours = 7,200 watt-hours per day
7,200 watt-hours per day / 1000 = 7.2 kWh per day
7.2 kWh per day X 30 days = 216 kWh per month
216 kWh per month x 0.10 per kWh = 21.60 per month
Common Wattages for Household Appliances
The wattage on appliances or electronics varies by device. Typically, older model appliances use more energy, but newer models tend to be more efficient. You can also purchase ENERGY STAR appliances, which are among the most efficient appliances. According to the EPA, here's a list of typical wattage levels for your everyday devices.
Coffee maker 900-1200 watts
Microwave 750-1100 watts
Toaster 800-1400 watts
Dishwasher 1200-2400 watts
Washer 350-500 watts
Dryer 1800-5000 watts
Iron 100-1800 watts
Ceiling fan 65-175 watts
Space heater (40gal) 4500-5500 watts
Hair dryer 1200-1875 watts
Laptop 50 watts
Computer monitor 150 watts
Computer tower 120 watts
Television 19"-36" 65-133 watts
Television 53"-61" 170 watts
Hope this Helped if it did would you mind maybe viewing my channel and just leave a like or subscribe for a few days. I really like video's like these.
That ending is fucking golden
10/10 holy shit
You’re actually really good at explaining shit. Felt like you were talking to me like I’m stupid and I am and it helped👍
i understood more from this than 20 videos taught by teachers. thank you guys like geniuenly.
This one finally cleared up my confusion. Great video LMG.
Great video guys! I find this concept is extremely difficult to explain to people who aren't engineers (like me). Based on the way you explained it, this will be the first video I recommend to anyone wanting to learn more
The water gun vs hose analogy to explain power was great. Thanks
From his w=v×i days to his taycan ones, it's been electrifying to watch Linus go through adolescence. Keep up the great content 👍🏼
I still don't get it.
nfaguade Me neither. This shit is hard.
yeah, maybe we need to watch it several times,
Keep in mind this is an oversimplified explanation of how electricity works. Sometimes analogies end up complicating things up instead of working as crutches. For instance, people often assume electrons = electricity, but you CAN and DO have electricity WITHOUT electrons (see: certain types of batteries). All you really need is a non-neutral particle to use as an electromagnetic carrier. In essence: electricity = electric field + magnetic field.
If you really want to grasp how electricity works, and if you don't have a deep understanding of higher level mathematics, I seriously recommend you read "A VISUAL TOUR OF CLASSICAL ELECTROMAGNETISM" (just google it. It's pretty much the first link) by MIT. It pretty much explains how electricity actually works alongside a couple of equations. But even that interpretation doesn't tell the whole story. Electricity is actually quite complex when getting into the nitty-gritty.
Also, "static electricity" isn't really static. Fucking jargon end up complicating things even further.
+m8onethousand you may want to edit that, you said crotches, instead of crutches.
+m8onethousand you may want to edit that, you said crotches, instead of crutches.
I've always imagined electricity as traffic on roads or highways. Voltage being the speed on the highways and amperage being the traffic. I guess wattage in this analogy would be traffic per hour at a given speed and amount of traffic.
Amperage is measured in time, (electrons passing per second) so you shouldn't think of voltage as the speed of traffic because it would imply that the more volts, the more traffic is moving past a given point per second.
Think of volts as "pressure" or "muscle".
Remember, volts are being created by some sort of physical "muscle" or turbine that physically moves to "push" the electrons forward.
In the traffic analogy, you can think of volts as the physical horsepower of the cars on the road.
So if the traffic maintained the same speed and there were the same number of vehicles, but suddenly all the vehicles turned into tow trucks, the voltage (horsepower) would increase while the amperage (number of vehicles per second) would remain the same.
Traffic is easily the best explanation.
no, water in a pipe is easily the best explanation. the different terms and concepts match up really well.
water pressure = voltage (volts)
size of the pipe = resistance (ohms)
how much water flows through the pipe (voltage/resistance) = current (amperes)
how much water flows * how much pressure it took to move it (current*voltage) = work or power (watts)
gallons of water per unit time = amount of energy used or contained (watt-hours or amp-hours)
@@dialecticalmonist3405 volts is like the amount and amps is the strength
@@thinkdunson thank you for keeping it simple
Thank you for this video.
I’m not an engineer or electrician or whatever, but I can (and do) basic DIY wiring around the house. I’ve watched many CZcams videos to learn how to do this safely, but never been able to figure out why. Why are breakers/wires in amps? Why is my power bill in KWh.
Finally....I understand what it all means.
I think this is the third time I've watched this, and the second time I went to place it into favorites only to find it had already been placed there
:) I'm studying for an architectural licensing exam and this made it that much more enjoyable. Thanks for the fun and educational video :D
Clean, precise and using imagery which hits it home! Well done sir!
You confused me even more because now I have your explanation and my teacher's explationation. Both going crazy in my head
Compliments on Neti-Pot & Kool-Aid references. Especially the Kool-Aid - “...instead of what’s coming out of your walls...” bit. Kudos.
2:35 Every time he said "water" after this, this was the only thing I could think of. "Wat-er" "wat-er pistol"
haha same here i kept laughing uncontrollably for the rest of the video...definitely one of Linus's funnier videos. oh and hi from the future.
3:30 that water wheel is spinning the wrong way
Its an illusion nvrmind
Due to fps and pixel persistence it can be seen as spinning both ways.
Actually for me the inner wheel spins clockwise and the outer anticlockwise.
Try it with different video speeds.
+bastard™ wtf mam
+bastard™ I AM AT SCHOOL
+Michael Mendieta I see what you mean. Interesting
Thanks so much. I got a sudden passing curiosity about this and this made it easy and entertaining to digest. I feel like a hummingbird, but at least I'm a hummingbird with a helpful treat to grab my attention.
I really like this guy. I first watched him when discussing the three general types of sound equipment (i.e. subwoofers); he popped up in my YT feed for this video, so I thought it might be a great video. It is. He’s funny, explains the material well, and it’s actually educational for general topics. I sure hope he is around still, given this video is 7 years old.
He is! Main channel is Linus Tech Tips :)
@@TeddieBean Oh, awesome! Thank you!
1:16 Actually its called Electromotive Force (EMF), and is only measured in volts due to it having a base unit matching that of the volt (kgmAS^-3 if I remember correctly)...
other than that, and 15 amps of sucking power... surprisingly good video with good analogies! good on ya
Linus, european is 230 Volts. Trust me, I'm an engineer. I always wanted to be able to say that.
Xiefux That's true I guess. Better than what I said.
not necessarily , where i live it's 220 Volts.
I saw it kind of varies between 220 and 240 depending on the country.
It's officially standardised at 230, but with large tolerances so countries using 220 or 240 can stay at those voltages but still be compliant with the standard..
that the official value, and you should know that homes are very often not that high, or sometimes are higher!
Sean Anderson If you're talking to me, for god's sake people, I just took an opportunity to say something. Take a chill pill. This isn't how you make friends you know.
My hose has a jet setting. The water shoots out super fast, which feels like it's actually spraying more water. In reality, my plumbing can only push so much water out, and that volume is already maximized with the open hose. So, it doesn't fill a bucket any faster if I use the jet or not.
When I use the jet nozzle it increases the PSI (volts) by decreasing the nozzle diameter (amps), but in the end it's still spraying the same amount of water (watts).
so to conclude this, if your breaker is 16amp you can enjoy more wattages in europe :PP
joules is not explained, but joules is the amount of energy per second, its a value that reflects a total amount of energy, it can be kenetic or power, wattage is equal to joule, so a vaccum cleaner from 1000 watts moves 1000 joules of energy around per second. that way you can even calculate how much money the electrical company is gonna charge u to run this vaccum cleaner
For those wondering: a kilowatthour is 3.6 megajoules and a milliamphour is 3.6 coulomb. When dealing with AC the whole deal gets a little more complicated but it's a similar idea.
You’re not helping.
Hair dryer bought in monaco would not work nice if you plug it in New York but I'm sure it will not blue smoke. In monaco the voltage is 230V and it's 110V in New York I think.
You're right. It just won't work, or work poorly.
No, the amperage is different. 5 Amps vs 10 Amps.
And? As long as the wall is able to deliver it, you won't have problem. It's like a computer : it takes just the current that it needs
L3xou97 doesn't extra current fry electronics if they don't have a fuse or circuit breaker?
An appliance only draws as much current as possible. In this case, since the hair dryer is basically a resistive load, only so much current can flow at a voltage, and since 110V is less than 220V, there is less current flowing.
Remembering the fundamental types of quantities is key!
Watts are a quantity of power: energy/time.
So, a watt-hour or kilowatt-hour is power • time, which simplifies to a quantity of energy.
Amps are a quantity of current: charge/time.
So, an amp-hour or milliamp-hour is current • time, which simplifies to a quantity of charge.
To be more precise, you can consider the actual units of watts (W), joules (J), amps (A), coulombs (C), and seconds (s).
1 W = 1 J/s,
1 A = 1 C/s.
4:46 best voice crack in years
you are right sir
funny
First time ive ever slowed the playback speed
Why did you slowed the playback speed?
@@hakaishin4314 someone have to really understand shits on his life
I did the same and now im distracted at how funny it he sounds.
oh how i wish your videos existed while i was in college. thank you
As a mechanical engineering graduate that not practicing, I need this video to refresh regularly.
Very well explained. Thank you for this! 1 years since I did electronics at school and had forgotten :)
haha love these jokes with editors :)
This man can explain more in 5 minutes than my science teacher in 5 years
So basically, (I am a beginner just starting to do simple electronics with breadboards btw), Volts are the pressure/force in which the electricity is pushed, Amps measure the speed of electricity flowing, and watts is the measure of the electricity itself? Just trying to make sure and not be confused, thank you for the explanation btw, great analogies and comparisons compared to other videos I've tried.
Nice little ending there, dammit John.
Watt is love, baby don't Hertz me, no Morse
Go ohm you're drunk
Too much reactance
Yes, but what are the ants reacting to?@@bixbyfamily5682
y
hahaa excellent!
Another unit is resistance measured in ohms. If you multiply resistance by current you get the voltage so if you multiply the current squared by the resistance to get power.
i'm building a small heated paint storage room in an unheated garage. Think of a space 4x8 x 9' tall with some shelves, and a door, insulated walls. I want to install a heater. Oil Filled electric space heaters run at 120 volts, consume up to 1500 watts, and put off a set amount of BTU's. There are also 4 foot electric base board heaters, that lack the thermal mass of the oil filled electric radiator style that come in 120 and 240 volts. I found your video as I searched for information on "higher voltages, consume lower amps, and are cheaper to run." But with electric heat, I got the impression that a watt of energy in, regardless of whether its 1 leg at 120 or 2 leg at 240, will produce the same BTU's. And instead of drawing 15 amps on one leg, I'd just be drawing 7.5 amps on two legs, and thus wind up with the same bill from the electric company at the end of the month, and I have to give up the thermal mass of the oil filled radiator if I go to 240.
BUT, i have the sense i'm missing something. Can you go more into depth on how this works with AC voltage, and amperage, and how that relates to creating BTU's with electric heat, and the Kilowatt Hour Draw and expense? I love the geeky math stuff. Thanks!!
just one day after my electricity test linus posts this
Better analogy for car people:
Volts = Torque
Amps = RPM
Watts = Horsepower
Watts are definitely like horsepower, they literally measure the same thing. I wouldn't say that amps are like RPM or volts like torque tho. If anything it would be the opposite, which is still a stretch. Torque is measured in newton-meters, which is literally a joule. Watts are joules or newton-meters per second, ironically, this may make it easier to understand torque and power in motor vehicles. RPM is frequency just like hertz which in a given context could be revolutions per second, so it's kind of like pressure at which the torque or amps are going. Case in point, shit analogy, the water flow analogy does a way better job.
@@brauljo Cristopher is right. Analogous to mechanical systems where force is the effort variable and velocity is the flux variable, in rotational mechanical systems torque (J/rev) is the effort and angular velocity (rev/s) is the flux.
I needed this, thank you.
Wow, had Linus presenting an actual advert for pulseway before my video, and not just a sponsored part of the video.
6 years later and I’m here. Thanks for always helping Linus
These tech videos are getting more meme-tastic, and I'm okay with that
3:33
"If we think of the hose and the water gun pushing out electricity, ..."
- Linus will be wet or electrocuted?!
Everytime we'll be having a test about electricity, I'd be watching this the night before. Lezgo, Linus!
Electrician at my house: "I mean this is only pulling 12 amps, that shouldn't have been enough to trigger the breaker."
Me: "Pffft yeah that's what I thought too. That's way too low."
My Brain: "I have no fucking clue what he's saying! Stop talking."
Thank You for these videos!
I work in HVAC as a helper and I'm trying to learn use of multimeter. For detecting/trouble shoot any type of trouble such as electic motor problems, capacitors, transformers and contactors.
I want to learn and have a clearing understanding of testing volts, amps, hertz, and contiuity etc.
This is all very confusing, and where to start and or comprehend. I just don't know what to look for.
Please help????????????
Me too! Got any answers yet? Please respond 🙏 👊
It's too bad joules aren't used more often. They feel like they should be more commonly used.
I'm sure joule find a way to use them more often
it's more of a science unit of measurement rather than something you use in every day life to describe stuff like miles per hour. I guess you could substitute calories for joules in food, but that would just be change for the sake of change
@@HearMeLearn That's a fair point. the way measurement systems are done today it'll just be change for the sake of change and we get enough of that with software UI changes.
that's why we use watt-hour instead of joules they both measure energy but i'm guessing joules is used more in physics than Electricity
My friend Bobo recently installed some light fixtures and he put in the wrong amount watts in the house which blew up all the volts coming in. He said he didn't have enough amps and was almost electromuted himself. I'm going to send him this video so he can get it all sorted out!
Thank you. ❤ your "energy" in the video is beautiful. No pun intended😂
It's actually quite a bad thing to use tap water in a neti pot due to rare bacteria that may be present. It's recommended to use distilled water.
Hey Linus,
What are VA (Volt Ampere) used in Uninterrupted Power Supplies. It is not "Watt".
A 1400VA UPS is rated at 700W.
Any idea WHY!?
A Volt-Amp for VA is 'Apparent Power', which comes from a simple Current x Voltage calculation. However, due to the way AC current behaves in a circuit that contains Inductors and Capacitors, the simple calculation doesn't provide a 'True Power' value. Something known as the 'Power Factor' has to be calculated. 1400 VA is the maximum 'Apparent Power' available without 'Power Factor Correction', whereas 700W is the maximum 'True Power' available. To explain it all properly would create a long comment post. This site does a nice job of explaining 'Power Factor Correction': www.kwsaving.co.uk/Business/pfc/pfc-simple.htm
Thanks for your time and explanation.
+ILikeHotCurrys A simple explanation of the phenomenon could be put this way: AC is pretty much a sine wave. When you have, like you well said; capacitors, inductors, etc. your AC wave tends to shift and thus isn't synchronised with the one on your utility, meaning that it lags behind. Which in short means that the "power factor" of that appliance is SHIT and thus the "apparent power" is extremely misleading by mere virtue of how it's being measured since it's not being "used".
That "out of phase" electricity is called "reactive power" and industrial places like factories are CHARGED for that wasted energy, while in the case of a domestic house it ISN'T added to your bill. Factories often times get around this problem by having capacitor banks at very precise ratings to counteract the out-of-phase leak.
Mohammed Sharaf Because it is AC, and P=U*I is not a precise way to calculate power. But it is very close.
I thought electricity followed from positive to negative. This is why it's good to refresh ur knowledge with these videos
Thanks! Easy to understand (clearly explained) and very useful!
3:51 What kind of keyboard is that??? That thing is gorgeous!
Type - x ( Type Writer) 😂
As an electrical engineer I was surprised of how well Linus presented it. Well done! Oh btw.. it's 230V 50Hz in most of Europe, not 220V.
Oh no, Hertz.. this was not covered
@@adamknight5089 please forgert it 😭
+UndercoverFerret Is just that 220V gives an easier calculation. However the voltage in Europe goes from 220-240V but on average 230V.
@@adamknight5089 It's just how many times the current switches direction per second.
@@XouZ88 No. It's 230V, with allowed -10% or +6% variance, according to EN50160 (tighter regulation on the above nominal here). Facts.
Good job once again. I'm looking to get a home back-up generator and this is helping me explain the details of calculation what size we need to the family. Thanks!
just add up the wattage of everything you might want to run at once.
if you want to still be able to power the fridge, the microwave, etc., look at how much wattage they use and add them up.
central air for a typical 3 bedroom house might use around 3.5 - 4kW.
so a microwave, central air, a fridge, and a computer, all added together might use around 6 - 6.5kW.
as with pc psu's, you want a bit of overhead. so for 6kW usage, i would say get an 8kW generator at the very least.
but if all you care about is keeping the fridge, microwave, and tv running, then you could get away with a 2.5 or 3kW genny.
and keep in mind, those tiny little space heaters use 1500 watts. so for winter emergencies, you're better off getting a larger generator and running the central air.
Watching you for years. you are doing great work!
I wonder how many people try to charge their phones in a bucket after this
Miss the days when Linus spoke much faster, saving time.
GO to setting and make the speed 1.5x you'll save tons of time
MrAvatin wow I've never thought of that, honestly thank you.
Set your thinking to 1.5x and you'll think of it next time.
*You just taught me in 4 minutes and 12 seconds what my idiotic "Science Teacher" in high school couldn't in several YEARS.* I DON'T CARE about the equations, I DON'T CARE about the graphs. I CARE ABOUT PRACTICAL APPLICATIONS. If he couldn't understand *that* then he didn't belong in the teaching profession AT ALL. Do those other things matter? I'm sure they do! But they are MEANINGLESS without exactly what *you* just explained here being taught FIRST! I'm guessing I'm hardly the only one who failed science in high school *because my high school science "teacher" FAILED ME.* Bravo to you!!! YOU DESERVE A MEDAL!!!
to comprehend this better i have checked the 2 laws of "Ohm". However thanks a lot, that is the best video that explained the difference
so milliamp hours is pretty much like a fuel gauge telling you the total amount of energy inside of a full battery/cell? thanks!
Yes