At 20°C, the carbon resistor in an electric circuit connected to a 5.0-V battery has a resistance of 2.0 X 102 ?. What is the current in the circuit when the temperature of the carbon rises to 80°C? The temperature coefficient of resistivity for carbon is -0.5 X 10-3 ℃-1.

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.