AIPMT | 2015Alternating CurrentEasy

Question

A resitance ′R′ draws power ′P′ when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes ′Z′, the power drawn will be:

Options

A.
B.
C.P
D.

Solution


AC source                              Impendance = Z
                                 P′ = v. cosφ
⇒ V2 = PR                                P′ =
                                               (From phasor diagram)
                                              P′ =
P ′ = P
Hence option (4)

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