An electric heater of resistance 8 Ω takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.

Question

An electric heater of resistance 8 &#x3A9; takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.

Philoid · Accepted Answer

Here Resistance (R) = 8 ohms, Current(I) = 15 amp, time (t) = 1 sec

We know that according to Joule's law of heating

H = I²RT

H = 15²X8X1

H = 1800J/s