Question

An electric heater of resistance 8 ohm draw 15 afrom services mains for 2 hours calculate rate at which heat us developed in heater

Answer 1

Here Given that Resistance of the electric heater (R) = 8 Ω
Current drawn (I) = 15 A
We know that P = I2R
= 15×15×8
= 1800w or J/s
∴ Heat is produced by the heater at the rate of 1800 J/s.