About Units

Watt hours: Watt-hours (Wh) are a unit of energy equivalent to one watt of power used for one hour. This unit is commonly used to measure electrical energy consumption. For example, household electrical energy usage is often measured in kilowatt-hours (kWh), where 1 kWh equals 1,000 Wh.

Megajoules: Megajoules (MJ) are equal to 1,000,000 joules. This unit is commonly used to describe large quantities of energy, such as the energy content of fuels, electrical energy, and the energy output of engines.