Answers

2015-07-11T17:19:37+05:30
Consider a current I flowing through a resistor of resistance R. Let the potential difference across it be V. Let t be the time during which a charge Q flows across. The work done in moving the charge Q through a potential difference V is VQ. Therefore, the source must supply energy equal to VQ in time t. Hence the power input to the circuit by the source is.... P=VQ÷ t...... P=VI {I=Q÷t}...... Since, energy= p×t........ energy=VIt......... Energy in the form of heat.......... H= VIt -(1)........... According to ohm's law........ V= IR - (2)........ Substituting (2) in (1), we get......... H= (IR)It...... H= I2 Rt........... This is known as joules law of heating....
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