Energy is the ability to do work.
Because work is measured by multiplying the force applied by the distance moved, energy is measured in Nm or Joules.
1 Joule = 1 Newton metre. Symbol: J or Nm

If one joule of energy is expended in 1 second, one watt of power is said to have been expended.

There are many different types of energy. Some examples are:

Wind energy, solar energy, nuclear energy, electrical energy, potential engery.

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