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Question

A p.d. of 10 V is needed to make a current of 0.02 A flow through a wire. What p.d. is needed to make  a current of 250 mA flow through the same wire?
 


Solution

Applying Ohm's Law

R space equals space V over I R space equals space fraction numerator 10 over denominator 0.02 end fraction space equals space 500 space O h m s n o w space t o space g e t space 250 space m A space c u r r e n t space i. e.0.25 space A space c u r r e n t w e space h a v e space V space equals space I cross times R space equals space 0.25 space cross times 500 space equals space 125 space V

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