Your refrigerator uses an average of 350watts and your utility company charges $.10 per kilowatt-hour of energy (including taxes and fees). How much does it cost you to run your refrigerator for a year? Explain.

The cost of running the fridge for a year = (**Cost of energy per hour**) x (**Energy used in 1 year**)

We are given the **cost of energy per hou**r: $0.10 per kW-hr

Let's get the power used in 1 year in terms of kW and hr

kilowatt -> 1000 watts (kilo = a thousand)

350 W x (1 W/1000 kW) = 0.35 kW

So, the fridge uses **0.35 kW of power**.

1 year = 365 days = **8760 hours**

Now multiply it out with your calculator:

( 0.35 kW )( 8760 hr )( $0.10 /kW hr)

**$306.60 **

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**Hope this helps!