The joule (J) is the unit of energy, work, and heat in the International System of Units (SI).
- One joule is equal to the amount of work done when a force of one newton displaces an object by one meter in the direction of that force.
- It can also be defined as the amount of energy dissipated as heat when an electric current of one ampere flows through a resistance of one ohm for one second.
- While joules are a fundamental unit, they are a relatively small unit of energy. Therefore, larger units like kilojoules (kJ) or megajoules (MJ) are often used for practical applications.