What Is a Diode?
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- čas přidán 19. 05. 2018
- This electronics video tutorial provides a basic introduction into diodes. It explains how a diode works and how to perform calculations when it's in series with a resistor.
What Is a Diode? • What Is a Diode?
How To Solve Diode Circuit Problems:
• How To Solve Diode Cir...
Diode Logic Gates - OR, NOR, AND, & NAND:
• Diode Logic Gates - OR...
Clipper Circuits:
• Clipper Circuits
Clamper Circuits:
• Clamper Circuits
Half-Wave Rectifiers:
• Half Wave Rectifiers
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Full-Wave Rectifiers:
• Full Wave Rectifiers
Full-Wave Bridge Rectifiers:
• Full Wave Bridge Recti...
220V AC to 12V DC Converter:
• 220V AC to 12V DC Conv...
Capacitor Voltage Booster Circuit:
• Capacitor Voltage Boos...
Half Wave Voltage Doubler Circuit:
• Voltage Multipliers - ...
Full Wave Voltage Doubler Circuit:
• Full Wave Voltage Doub...
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Voltage Multiplier Circuit:
• Voltage Multiplier Cir...
Light Emitting Diodes:
• LEDs - Light Emitting ...
Power Dissipation In LEDs & Diodes:
• Power Dissipation In R...
Final Exams and Video Playlists:
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Full-Length Videos and Worksheets:
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1N4007 Diodes:
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I remember which end is the anode because the arrowhead in the symbol for a diode looks like an "A" (for Anode) on its side. It points in the direction of "conventional" positive-to-negative (P-to-N) current flow, which reminds me that the anode has P-type semiconductor, and the cathode has N-type semiconductor. The vertical line for the cathode represents a wall that blocks "conventional" current from going from cathode to anode. That "wall" is represented by a ring marked around the cathode end of a "physical" diode.
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Another great lecture about diodes. I like the examples at the end. My only wish is that he elaborate on what it means to be a n-type or p-type in physical terms.
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Helpful
I've been enjoying your videos. They are extremely helpful as I learn about the terminology in my electrical/instrumentation textbooks. Could you recommend a particular order of viewing your videos to build the basic foundation to understanding these theories better? Thanks
Researchers who study the psychology of learning have found that the order in which you learn something is not important. That is good because we rarely have the time or opportunity to start something "from the beginning," which is different for different people because of their different backgrounds. It is fine to "fill in" your understanding as needed. I can't say much more because CZcams does not allow posts that provide or even suggest links elsewhere.
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Does diode block the flow of electrons as it does to current in flowing in one direction, since electrons flow in opposition with current. I.e diode allow current flow in one direction, block it in opposite direction, while electrons flow in opposite direction, will the electron b blocked hence it's flowing in the direction diode is blocking. Reply pls.
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I dont unerstand why the naming is different compared to a battery. I thought the anode of a battery was the negatively charged terminal that has excess electrons, so why would the anode of a diode be the electron deficient part that contains holes, its just confusing. I was just reading somehting and had a thought: Is the anode of a battery actually initially positively charged, becoming negatively charged only when the chemical reaction happens within the battery and the resulting free electrons are attracted towards it?
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Electrons flow from negative to positive?
Yes. Electrons flow from negatively charged area to positively charged area. Therefore, current which is a flow of electron vacancy or hole, flows from positive to negative. If you add a battery to a circuit then current will flow from the positive terminal of the battery towards the negative terminal of the battery through all the other elements in the circuit.
To ease the confusion, think of heat flow according to thermodynamics. Heat flows from high temperature area to low temperature area. Also if you think of water, it flows towards the area where water is less or the pressure is less.
Just like that everything in nature flows from it's majority towards it's minority.
In a negatively charged area, electrons are higher in number. So electron flows from negative to positive.
Current flows in the opposite direction of electron flow. So, current flows from positive to negative.
@@farjanasharminswarna2450 Thank you so much
Welcome. Happy to help. :)
@@farjanasharminswarna2450 but current IS electron flow isn’t it? I’ve seen it explained that way in several videos
@@mrbushpilot current is electron flow, but it flows in direction opposite to electrons just like positive charges.
Negative charges flow from negative to positive(lower potential to higher) and positive charges flow vice versa.
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In 11:44, isn't that the diode is OFF because the forward voltage applied across its terminals does not exceed the diode's forward voltage threshold, which is according to the video is 0.7 volts? Please advise.
It is on because the source voltage is in negative value, flowing through the cathode (negative terminal) side of the diode. If the negative voltage source is flowing through the anode (positive terminal) then the current wont flow.
6:41 what about the resistance offered by cell?
Conventional Current Flows from the Cathode to the Anode against the Arrow.
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Electrostatics and circuits belong to one science not two. For a unified approach to learning Current and the process of conduction watch these two videos i. czcams.com/video/REsWdd76qxc/video.html and
ii. czcams.com/video/8BQM_xw2Rfo/video.html
Also, in the textbooks referred in the last frame of video i you will find descriptions of the operation of resistors, capacitors and inductors using this approach which makes it easier to understand.
There are also chapters in the textbook references which explain the operation of diodes and transistors using the unified approach.
Is it optional that a diode would be on if the voltage flowing across the diode is exactly 0.7?
What would happen if the voltage is less or more than 0.7?
If the voltage supplied across the diode is less than the diode voltage, then the diode won't "Turn On". Otherwise, the the voltage supplied across the diode exceeds the diode voltage, then the diode will "Turn On".
Pre-req:
PN Junction Video from him: czcams.com/video/ethnHSgVbHs/video.html
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So how would we use the diode?
so in reality if the real flow of electrons is from -ve to +ve then the diode conducts oposit to what it has been said.
i have a question. i ordered diodes to fix something and i recieved something that looks like an old camera film. is that normal?
but why is the current flowing from positive to negative in the example?
Probably a dumb question but in the 3rd example of 0V (low) going to -7(high) the diode would have a voltage drop of 0.7 volts but you have 0V passing the diode so even if the circuit is on, no current would flow because you don't have the voltage strength to pass the diode. Can someone explain what I'm clearly missing? I'm probably just dumb. lol
The 0V in the 3rd example is the high potential and the -7V is the low potential, so the potential difference is 0-(-7) = 7V which is more than the voltage drop in the diode (0.7V), so current will flow in the direction shown in the video.
@@ahmedbelal7370 that makes sense thanks !
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Just wanted to know, the power of a current is (currents)²voltage right? But he wrote p= vi
No, I will write the true formulas here:
P= V * I
P = V²/R
P = I² * R
P: power - I: current - V: voltage - R: resistance
Is it your own theary.
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Why the current unit in mA?