Define power and discuss how to determine power
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In physics, power is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time. Having no direction, it is a scalar quantity.
It is determined by:-
1) P = V I
2) P = I^2 x R
3) P = V^2/ R
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power is the rate of doing work
P = I²r
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