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Suppose that the cost of electrical energy is $0.12 per kilowatt hour and that your electrical bill for 30 days is $60.00. Assume that the power delivered is constant over the entire 30 days. What is the power in Watts?

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mjhelal

Answer: 690 W

Explanation:

A day has 24 hours, so a month has 24 × 30 = 720 hs

In a month whe spent a total of $60. 00, so per hour whe were  spending

[tex]60/720 = 0.083[/tex] $ per hour

We know the cost of one [tex]kw/hour[/tex]  is  [tex]0.012 kw/hour[/tex] so dividing the money spent in an hour among this value we get:

[tex]0.083/0.12 = 0.69 kw/hour[/tex]

This power delivered is constant, so every moment it is

[tex](0.69 kw)x1000 = 690Watts[/tex]

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