Form expression (i) the energy expended or heat generated in joules when a current of I amperes flows through a resistance of R ohms for t seconds is given

The above expression is known as Joule’s law, which states that the amount of heat produced in an electric circuit is

(i)    Proportional to the square  of the current i.e. H ∝ I²
(ii)    Proportional to the resistance of the circuit   H ∝ R
(iii)    Proportional to the time for which the current flows through the circuit i.e. H ∝ t

Heat produced in K cals, H = I2Rt  I2Rt             [ 1 k.cal =4,180 J 4,200 J]
                                        4,180     4,200

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