It's not possible to create or destroy energy. It is only possible to transform it from one type of energy to another, or move it from one place to another.
This means that the total amount of energy is always the same, this is called the conservation of energy.
For example when an object falls, gravitational potential energy is changed to kinetic energy. Similarly, stretching an elastic band transforms chemical energy into elastic potential energy. In a solar cell, light energy is transformed into electrical energy.
REMEMBER: Conservation of energy means changing one type of energy to another.
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