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Worksheet: Units of Energy

Q1:

What is 7.8 kWh in joules?

Q2:

Which of the following is the correct definition of a watt-hour?

  • AA watt-hour is the amount of time it takes for a process to increase in power from 0 watts to 1 watt.
  • BA watt-hour is a measure of the power of a process that is equivalent to the transfer of 1 joule of energy in 1 hour.
  • CA watt-hour is the amount of energy that an electrical device transfers in 1 hour.
  • DA watt-hour is the amount of energy transferred by a process that has a power of 1 watt and acts for 1 hour.
  • EA watt-hour is the amount of time it takes for a 1-watt device to transfer 1 joule of energy.