(A) Force:
An agent which produces or tends to produce, destroy or tends to destroy motion
The unit of force is –
(i) Newton in S.I. units. The force required to give a mass of 1 Kg. an acceleration of one meter per second per second.
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(ii) Dyne in C.G.S. unit. The force required to give a mass of 1 Kg. an acceleration of one meter per second per second.
(B) Work:
Whenever a force acts on a body & the body undergoes a displacement in the direction of the force then work is said to be done. Force x distance moved. Unit of work is Joule (1 m Newton) = Potential difference x current x time.
(C) Power:
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The unit of electric power is watt.
One watt power is expanded when one Joule of work is done in one second.
(D) Energy:
Total amount of work done in a given time is called the ENERGY. Its unit is watt sec.