# Which of the following is not a unit of energy? (1) joule (2) newton metre (3) kilowatt (4) kilowatt-hour

In physics, we can define energy as the capacity to do work. The SI unit of energy is joules (J). kilowatt is the unit of power.

## Various energy units

Energy units can be preceded by various factors and there are usually different units for measuring energy. Some common units include:

1. British thermal unit (BTU)
2. Horsepower
3. Kilowatt-hour (kWh)
4. Calorie
5. Electronvolts (eV)
6. Hartree (the atomic unit of energy)
7. Rydberg units
8. Barrel of oil