Energy is the capacity or power to do work, such as the capacity to move an an object by using force. Energy can exist in a variety of forms, such as electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to another.
Sources of Energy
All energy that we use essentially comes from the sun. The majority of energy used to generate electricity is stored in fossil fuels. These are call non renewable sources of energy.
There is an increasing and urgent need to change how we generate electricity by using renewable sources of energy like solar and wind.