08-16-2017, 08:55 PM
Energy is defined as the capacity of a physical system to perform work. In essence, energy is a fundamental quantity that can exist in a range of different forms, most notably heat, light, kinetic, electrical and potential energy. Energy cannot be created or destroyed, but can transition from one form to another. For example, the kinetic (movement) energy from a clap can become sound energy when hands make contact with one another.Energy efficiency refers to the proportion of useful energy that can be converted from a
source into a desired form. In any energy transfer, the output desired energy form (if measured in joules) is always less than the energy source in joules because during the conversion some energy is expended in different forms during the conversion.
