Unit Conversions Video Lessons

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Problem: Your electric utility bill probably shows your energy use for the month in units of kilowatt-hours. A kilowatt-hour is defined as the energy used in 1 hour at a rate of 1 kilowatt (1,000 watts); that is, 1 kilowatt-hour = 1 kilowatt × 1 hour.Use this fact to convert 1 kilowatt-hour into joules.If your bill says you used 900 kilowatt-hours, how much energy did you use in joules?

FREE Expert Solution

We know that 1 kWh = 1000 Wh

But 1 W = 1 J/s

So, 1000 Wh = 1000 J/s h

But 1 h = 3600 s

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Problem Details

Your electric utility bill probably shows your energy use for the month in units of kilowatt-hours. A kilowatt-hour is defined as the energy used in 1 hour at a rate of 1 kilowatt (1,000 watts); that is, 1 kilowatt-hour = 1 kilowatt × 1 hour.
Use this fact to convert 1 kilowatt-hour into joules.
If your bill says you used 900 kilowatt-hours, how much energy did you use in joules?

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