Question

an electric heater of resistance 8 draws 15 current from the service main 2hrs calculate the rate at which heat is develope in the heater

Answer 1

Given that Resistance of the electric heater (R) = 8 Ω

Current drawn (I) = 15 A

We know that P = I ² R
= 15×15×8

= 1800w or J/s

Heat is produced by the heater at the rate of 1800 J/s.