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An a.c. voltage V=Vm sin omega tis applied across a (i) series RC circuit in which the capacitive impedance is 'a' times the resistance in the circuit, (ii) series RL circuit in which the inductive impedance is 'b' times the resistance in the circuit. Calculate the value of the power factor of the circuit in each case. |
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Answer» SOLUTION :Power factor of an a.c. circuit is given by `cos phi = R/Z` <BR> (i) In a series RC circuit it is given that Z =aR `rArr` Power factor `=R/Z = R/(aR) = 1/a` (ii) In a series RL circuit it is given that Z= bR `rArr` Power factor `=R/Z = R/(bR) = 1/b` |
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