Units of energy

There are two main units of energy:

Joules

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

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

1 \text{ kWh} = 1000 \text{ W} \times 3600 \text{ s} = 3,600,000 \text{ J}

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

1 \text{ kWh} = 3,600,000 \text{ J}

Question	Answer
What are the two main units of energy?	Joules and Kilowatt-hours (kWh).
What is one joule defined as?	One watt-second, the energy transferred when one watt of power is applied for one second.
What is one kilowatt-hour (kWh) defined as?	The energy transferred when one kilowatt (1000 watts) of power is applied for one hour (3600 seconds).
How many joules are in one kilowatt-hour?	1 \text{ kWh} = 3,600,000 \text{ J}.
Show the calculation to convert 1 kWh to joules.	1 \text{ kWh} = 1000 \text{ W} \times 3600 \text{ s} = 3,600,000 \text{ J}.
Where are kilowatt-hours commonly used?	In things like electricity bills.