Question

How much will be the heat developed in in a bulb of resistance 920 Ω working for
3 minute at 230 V ?

Answer 1

Resistance = 920 ohm

Time = 3 min or 180 sec

Voltage = 230 V

Heat produced = I^2×R×t

H = (V^2*t) / R. ( v = RI )

H = (230*230*180) / 920

H = 10350 w

Hence, heat produced in the bulb will be 10.35 kw