Meaning of Energy
Energy is the ability to do work. Energy has the same unit as work, that is, energy is measured in joules.
Life is impossible without energy. The demand for energy is ever increasing. Where do we get energy from? The Sun is the biggest natural source of energy to us. Many of our energy sources are derived from the Sun. We can also get energy from the nuclei of atoms, the interior of the earth, and the tides. Can you think of other sources of energy?
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