A copper wire of radius a = 0.161 mm has an aluminum jacket of outer radius b = 0.218 mm. There is a current i = 1.58 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 × 10-8-m and 2.75 × 10-8-m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V = 11.8 V between the ends maintains the current, what is the length in meters of the composite wire?

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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.