Two copper wires A and B have the same length and are connected across the same battery. If RB = 9RA, determine the following. HINT (a) the ratio of their cross-sectional areas AB AA = (b) the ratio of their resistivities PB PA (c) the ratio of the currents in each wire IB IA =

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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.