Energy can be defined as the ability to work. It is something that can not be seen or touched. It will be not wrong to say that energy is something that is always present but not visible. Energy is found in different forms in our surroundings. Movement, sound, heat and light all give the evidence about the presence of energy in our surrounding.

There are two main types of Energy.

1) Kinetic energy
2) Potential energy

Kinetic energy can be called energy in motion. In other words it is energy of a moving object. A thrown football, speeding automobile and a water fall are the example of the kinetic energy.

Potential energy can be defined as energy stored in the matter. This type of energy appears in different forms. It can also be defined as energy in a matter due to its position or arrangement of its parts. Potential energy can simply be called as stored energy. Some common example of the potential energy is gravitational potential energy, elastic potential energy and chemical potential energy.

Beside these two major types of energy there are some other forms of energy. That is Heat energy, Electrical energy, Chemical energy, Light energy and Nuclear energy.

Heath energy is basically the molecules movement. It is the subset of the kinetic energy. Electrical energy can be defined as the movement of electron due to electrical force. Chemical energy comes under potential energy until chemical reaction occur which results in atoms and molecules motion. Light energy is the form of energy in which movement of waves or light particles called Photon take place. Nuclear energy is the energy of certain elements in which the internal forces pent up on their nucleus. In sum Energy can be called the capacity to do work. If the object is moving it will be called Kinetic energy. But if there are some forces which prevent the object movement it is said to be having potential energy. Energy can be called the property of matter. That’s why scientist has discovered the ways to measure it. This measurement of energy helped man to understand how to use energy, how to change its form and what to do in order to increase energy efficiency.