Energy

Topic Content:

What is Energy?

Energy is the capacity to do work. It is a scalar quantityA scalar quantity is a quantity that does not depend on direction. It can also be defined as a quantity with magnitude only. Examples of Scalar Quantities include area, density, distance,... More, and its SI unit is the joule (J).

Work and energy are closely related. When work is done on an object, energy may be transferred to or from the object. Therefore, like work, energy is measured in joulesJoule is the SI (International System of Units) unit of energy and work. It is equal to the amount of work done when a force of 1 newton displaces a mass... More.

Forms of Energy:

Energy exists in different forms. Some common forms of energy are described below.

Chemical Energy: This is energy stored in substances such as food, fuels and batteries. Chemical energy can be converted into other forms of energy, such as heat, light and electrical energy.

Mechanical Energy: This is the energy possessed by a body because of its motion or position. Mechanical energy includes kinetic energy and potential energy.

Kinetic Energy: