What is the SI unit of energy?

The SI unit of energy is the joule (J).

Energy is a scalar physical quantity that is defined as the ability to do work. It is measured in joules (J) in the International System of Units (SI). One joule is defined as the amount of energy required to move an object with a force of one newton (N) through a distance of one metre (m) in the direction of the force.

Energy can take many different forms, including kinetic energy, potential energy, thermal energy, electromagnetic energy, and chemical energy. Kinetic energy is the energy of motion, while potential energy is the energy stored in an object due to its position or configuration. Thermal energy is the energy associated with the temperature of an object, while electromagnetic energy is the energy associated with the movement of charged particles. Chemical energy is the energy stored in chemical bonds.

Energy is a conserved quantity, which means that it cannot be created or destroyed, only transformed from one form to another. This principle is known as the law of conservation of energy. It is a fundamental concept in physics and is used to analyse a wide range of physical phenomena, from the motion of particles to the behaviour of entire systems.