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An operating electric circuit consists of a lamp and a length of nichrome wire connected in series to a 12- volt battery. As the temperature of the nichrome is decreased, what happens to the equivalent resistance of the circuit and the power developed by the lamp?

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scme1702

The resistance of the wire will decrease as its temperature is decreased due to reduced hindrance in the flow of electrons. This means the current will increase. Electric power:
P = I²/R
The power produced will thus increase since the current is increasing and the resistance decreasing.