an electric lamp of 100 w is used for 5 hr per day ,calculate the units of energy consumed by lamp in one day
Power of electrical appliance = 100 W = 0.1 kW
Time used = 5 h
Energy = power x time taken
=0.1 kW x 5 h
= 0.5 kWh
= 0.5 units (∵1kWh = 1unit)
The units of energy consumed per day = 0.5 units and for a month = 0.5 x 30 = 15 units.