# Problem: A watt is a measure of power (the rate of energy change) equal to 1 J/s.Calculate the number of joules in a kilowatt-hour.

1 kW = 10 w

1 watt = 1 J/s

1 hr = 3600s

###### Problem Details

A watt is a measure of power (the rate of energy change) equal to 1 J/s.

Calculate the number of joules in a kilowatt-hour.