Schaum's Outline of Electric Circuits by Joseph Edminister

Author:Joseph Edminister
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2014-12-21T16:00:00+00:00

EXAMPLE 10.6 Find the power delivered from a sinusoidal source to a resistor R. Let the effective values of the voltage and current be V and I, respectively.

Thus,

The instantaneous power entering a resistor varies sinusoidally between zero and 2RI2, with twice the frequency of the excitation, and with an average value of υ(t) and pR(t) are plotted in Fig. 10-5(a).

Fig. 10-5

EXAMPLE 10.7 Find the ac power entering an inductor L.

Thus,

The instantaneous power entering an inductor varies sinusoidally between Q and –Q, with twice the frequency of the source, and an average value of zero. See Fig. 10-5(b).

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