Question

A current of 200 mA through a conductor converts 40 joules of electrical energy into heat in 30 seconds determine the p

otential drop across the conductor
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Answer 1

ou have I=200mA, E=40J, t=30s, and you want to find the voltage drop.

First, you should know that P=V⋅I , so V=PI

Second, you have the amount of energy converted in a certain amount of time, so E=P⋅t

So, find the power and use it to find the voltage drop.

this works , but i thought energy was defined by W = P * t whitch would then be P = W/t