Question

A 2kWh heater, a 200W TV and three 100W lamps are all switched on from 6p.m to 10 p.m .what is the total cost at Rs.5.50 per kWh?

Answer 1

Answer:

55/-

Explanation:

total energy used in 1 hour = 2000W+200W+3(100)W

                                             = 2000W+200W+300W

                                             = 2500W= 2.5kW

total time = 10-6= 4 hrs

total energy used in 4 hrs = 2.5kWx4hrs

                                           = 10kWh

total cost = 10kWh x 5.5 = 55/-