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We use energy every day. It surrounds us in different forms, such as light, heat, and electricity. Our bodies use the energy stored in molecues of substances like carbohydrates and protein to move, breathe, grow, and think. We also use energy to do work and to play.
Humans have invented thousands of machines and appliances that use energy to make our work easier, to heat our homes, and to get ourselves from place to place. Some of these machines use electricity, while others, like automobiles, use the energy stored in substances such as gasoline.
The two most common forms of energy we use are heat and electricity. Heat is the energy of moving particles in any substance. The faster the particles move, the warmer the substance is. Electricity is the energy of electrons moving along a conductor like a copper electrical wire.
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