A washing machine uses 1.8 × 105 watts of power. If it is in use for 2 hours per day (on average), how many kilowatt hours will it use in 30 days? A. 1.1 × 104 kilowatt hours B. 36 kilowatt hours C. 18 kilowatt hours D. 540 kilowatt hours E. 1.1 × 106 kilowatt hours

A. 1.1 × 104 kilowatt hours

Explanation:

Here the power used by the washing machine is

where power is the rate at which energy is consumed.

This power can be rewritten as

We also know that the washing machine is used for a time of

t = 2 hours

every day for 30 days, so the total time the machine has been used is

Therefore, the number of kilowatt hours the washing machine has consumed is:

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