Question

what do we mean by energy

Answer 1

Measure of the ability of a body or system to do work or produce a change, expressed usually in joules or kilowatt hours (kWh). No activity is possible without energy and its total amount in the universe is fixed.

Answer 2

Energy is the ability to do work

Energy comes in different forms:

1. Heat
2. Light
3. Electrical
4. Chemical
5. Nuclear energy
6. Gravitational