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Define energy and state its unit

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Detailed Solution

Energy is the capacity to do work. Its SI unit is the Joule (J). Energy can exist in many forms like kinetic, potential, heat, light, and chemical energy. It cannot be created or destroyed but can change from one form to another.

Types of Energy

Kinetic Energy: Energy of moving objects.
Potential Energy: Stored energy in an object due to its position.
Chemical Energy: Stored in fuels and food.
Heat Energy: Present in hot objects.
Electrical Energy: Flow of electric current.

Units of Energy

Unit	Equivalent
Joule (SI unit)	1 J = 1 Newton × 1 meter
Calorie	1 cal = 4.184 J
Electron Volt (eV)	Used in atomic physics

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