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Units of energy

There are two main units of energy:

  • Joules - what you’re used to seeing.
  • Kilowatt-hours (kWh) - often shown in things like electricity bills.

Joules

Section titled “Joules”

One joule is one watt-second, which means it’s the energy transferred when one watt of power is applied for one second.

Kilowatt-hours

Section titled “Kilowatt-hours”

One is the energy transferred when one kilowatt (1000 watts) of power is applied for one hour (3600 seconds).

Converting between joules and kilowatt-hours

Section titled “Converting between joules and kilowatt-hours”

1 kilowatt-hour (kWh) is equal to 3,600,000 joules (J).