Temperature Effect on Resistance

By Prum ChanRatna, San Chakta, Chruy Channit

A light bulb is connected in series with a coil of copper wire and a DC power supply. The voltage is adjusted so that the bulb glows dimly. When the coil is blown the temperature of the coil decreases. Thus, the resistance of the wire decreases causing the current to increase and the bulb to glow brightly.

Temperature Effect on Resistance