A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for
A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for
(a) electrical energy supplied by the source, and
(b) electrical power spent by the source.
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Potential difference V is the work done in moving a unit charge
∴ Work done in moving a charge Q through pot. diff. V = QV
i.e. W = QV
but = Q / t = I Or Q = It
∴ W = VIt
Work done = Electrical energy
(a) :. Electrical energy = VIt is the expression
(b) Power is the rate of doing W
P = W/t = VIt/t = VI
P = VI is the expression.
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