Home » Handbook of O Level Physics » UNIT 6: WORK, ENERGY AND POWER

UNIT 6: WORK, ENERGY AND POWER

  • Energy: It is the ability to do work.

E = W

  • Work: It is the product of force and the distance moved in the direction of force.

    W = F x s

    • Unit: J

  • Forms of energy:

    • chemical

    • nuclear

    • radiant

    • electrical

    • heat

    • mechanical

      • kinetic energy

E = (m v²) / 2

      • gravitational potential energy

E = W h = mg h

      • elastic potential energy
  • Principle of Conservation of Energy: Energy can be converted from one form to another but the total amount remains constant.

  • Efficiency = (useful energy output) / (total energy input )

  • Power: It is the rate of doing work.

P = W / t

OR

It is the rate of energy conversion.

P = E / t

    • Unit: W

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