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## Answers

The work done in moving the charge Q through potential difference V is VQ. Therefore, the source must supply energy equal to VQ in time t. Hence the power input by the circuit in the source is

P = V*Q/t = VI (since Q = It)

Or the energy supplied to the current by the source in the time t is P*t that is VIt. The energy expended by the source gets dissipated in the resistor as heat. Thus for a steady current I, the amount of heat H produced in time t is

H = VIt

Applying Ohm's law, we get

H = I

__²Rt__