State the three factors on which the heat produced by an electric current depends.

Heat produced in a wire depends on
(i) the square of the current (I²)
(ii) resistance of wire (R)
(iii) time (t) for which current is passedSince the heat produced is directly proportional to the square of current,
H ∝ I²,
if the current is doubled, the heat produced will become four times and if the current is halved, the heat generated will become one-fourth.
Since the heat produced in a wire is directly proportional to the resistance,
H ∝ R, if the resistance is doubled, then the heat produced will also get doubled and if the resistance ishalved, the heat produced will also be halved. This means that a given current will produce more heat in a high resistance wire than a low resistance wire.
Since the heat produced in a wire is directly proportional to the time for which current flowsH ∝ t,
if the current is passed through a wire for double the time, then the heat produced is doubled and if the time is halved, the heat produced is also halved.