We convert one form to another while using energy to make useful changes. Energy is part of nature. It appears in many forms. Some of the most common forms of energy are electrical energy, chemical energy, radiant energy, kinetic energy, thermal energy, gravitational energy and nuclear energy. Each of the different forms can be converted into the others.
People can use all of the different forms to make useful changes and do work.
Electricity is the most versatile energy source. Electricity is the most convenient form of energy for most uses in home, school, office and industry. Electricity can be used in almost any way, while other forms of energy are less versatile. Electricity can power huge motors and can create heat. Electricity can drive complex devices from stereos to electron microscopes.