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If a 60W incandescent bulb is replaced by a 15W fluorescent bulb, how much less electricity energy (in kilowat*hours) is consumed in a week by the fluorescent bulb, operating for 12 h each day?

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Answer:

3.78 kWh

Step-by-step explanation:

Power of incandescent bulb = 60 W = 0.06 kW

Power of fluorescent bulb = 15 W = 0.015 kW

Number of hours in a week if each day the light is turned on 12 hours

12×7 = 84 hours

Difference in power

0.06-0.015 = 0.045 kW

Multiplying with the number of hours


0.045* 84=3.78\ kWh

Hence, the fluorescent bulb will consume 3.78 kWh less electricity energy than the incandescent bulb.

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