Question

A 2 kw heater, a 200 watt TV and three 100 watt lamps are all switched on from 6 p.m. to 9 p.m. What is the total cost of energy consumed at Rs. 7.30 per kWh ?​

Answer 1

We know that,

Total energy conserved, E=p×t

=[2+0.2+3×0.1]×4hr

=2.5×4Rwh

=10Rwh

Rs5.50=10×5.50=Rs55

We get, Rs55.