High School

A home uses ten 100-watt light bulbs for five hours per day. Approximately how many kilowatt-hours of electrical energy are consumed in one year?

Answer :

Final answer:

The total energy consumed by ten 100-watt light bulbs used for five hours per day over a year is 1825 kilowatt hours.

Explanation:

This is a question about energy conversion and consumption, and can be solved using the formula E = Pt. Each 100-watt light bulb uses 100 watts of power. So in total, the ten bulbs use 10*100 = 1000 watts, or 1 kilowatt (kW). Each hour, these bulbs use 1 kilowatt hour (kWh), so in five hours, they would consume 5 kilowatt hours (kWh). Therefore, over a year, which has 365 days, the total energy consumption would be 5*365 = 1825 kilowatt hours.

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