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A central air conditioner uses 4.5 kilowatts. It runs for 10 hours over the course of a day. How much energy does the air conditioner use during that day?

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Arnold11
So we want to know how much energy does an air conditioner use during the day if it runs for 10 hrs and it uses 4.5 kW. So per one hour the air conditioner uses 4.5 kW/h, in other words, it uses 4.5 kW of power in one hour. In 10 hrs it uses 10 times as that or 45 kW. So the correct answer is the air conditioner would use 45 kW during that day. 

Answer: The correct answer is 45 kWh.

Explanation:

The expression for energy in terms of power and time is as follows:

E=Pt

Here, P is the power and t is the time.

As it is given in the problem that A central air conditioner uses 4.5 kilowatts. It runs for 10 hours over the course of a day.

Put P= 4.5 kW and t= 10hr.

E=(4.5)(10)

=45 kWh

Therefore, the energy used by the air conditioner is 45 kWh.

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