An energy efficient light bulb uses 15 W of power for an equivalent light output of a 60 W incandescent light bulb.How much energy is saved each month by using the energy efficient light bulb instead of the incandescent light bulb for 4 hours a day? Assume that there are 30 days in one month.
A)5.4 kW.hr
B)1.35 kW.hr
C)21.6 kW.hr
D)1.8 kW.hr
E)7.2 kW.hr

Question

Quizplus · Accepted Answer

The energy saved each month is the difference in power consumption between the two bulbs multiplied by the number of hours they are used each day multiplied by the number of days in a month.Energy saved = (60 W - 15 W) * 4 hours/day * 30 days/month = 1.35 kWh/monthTherefore, the correct answer is A.

An Energy Efficient Light Bulb Uses 15 W of Power