Question
Sat February 02, 2013 By:

what do you mean by energy?

Expert Reply
Mon February 04, 2013
Energy is defined as the ability or capacity to do work.
Energy is a quantity. In simple words, energy is the ability of a physical system to produce changes in another physical system. Example: heat energy, sound energy, kinetic energy etc. The SI unit of energy is joules (J).
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