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Energy: It is the ability to do work.
E = W
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Work: It is the product of force and the distance moved in the direction of force.
W = F x s
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Unit: J
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Forms of energy:
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chemical
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nuclear
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radiant
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electrical
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heat
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mechanical
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kinetic energy
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E = (m v²) / 2
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- gravitational potential energy
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E = W h = mg h
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- elastic potential energy
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Principle of Conservation of Energy: Energy can be converted from one form to another but the total amount remains constant.
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Efficiency = (useful energy output) / (total energy input )
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Power: It is the rate of doing work.
P = W / t
OR
It is the rate of energy conversion.
P = E / t
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Unit: W
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