MIT Physics Demo -- Temperature Effect on Resistance

A light bulb is connected in series with a coil of very fine copper wire and a DC power supply. The voltage is adjusted so that the bulb glows dimly. When the coil is immersed in liquid nitrogen the resistance of the wire decreases causing the current to increase and the bulb to glow brightly.
See the original video and more on MIT TechTV here - techtv.mit.edu/videos/1689-tem...

[@licianinh]

Usually resistance depends on three things, the material, the length and the area. However, heat affects resistance, the higher the temperature the higher the resistance.

[@SpeedrunnerG55]

@madogmgd actually quite the oposite, you are almost right but as a semicunducting material ( silicon) increases tempature it will actually conduct more. since it has a negative tempature coificient. ustabalising the q point and having less colntrool

[@madogmgd]

I get it thats why computers need liquid cooling for energy to pass through quickly.
Thus the computer cools when it receives enough energy to do commands.

[@TheNasir81]

can anyone tell me where i can get these items

[@jcavs9847]

on the black market