We extensively use electrical energy in our day-to-day life. We use many appliances like lights, fans, mixers, washing machines, refrigerators, air conditioners which use electrical energy. Many equipments like pumps, motors also work on electrical energy.

Elecric energy is produced in a number of ways. It is basically the conversion of some other form of energy into electricity. For this purpose we can use chemical energy (in coal, diesel etc.), gravitational energy (of water stored in a dam), wind energy, solar energy, nuclear energy etc.