The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.
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Saturday, 19 March 2011

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.

Source: MIT TechTV

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