An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________?

(A) 2KWh ()
(B) 20KWh (X)
(C) 6KWh (X)
(D) 12KWh (X)

Answers: An immersion heater of 400 watts kept on for 5 hours will consume electrical power of  2KWh.