AC Power Discussion D9.3 Chapter 5. Steady-State Power Instantaneous Power Average Power Effective or RMS Values Power Factor Complex Power Residential.

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Presentation transcript:

AC Power Discussion D9.3 Chapter 5

Steady-State Power Instantaneous Power Average Power Effective or RMS Values Power Factor Complex Power Residential AC Power Circuits

Instantaneous Power Note twice the frequency

Average Power Purely resistive circuit Purely reactive circuit

Effective or RMS Values We define the effective or rms value of a periodic current (voltage) source to be the dc current (voltage) that delivers the same average power to a resistor. root-mean-square

Effective or RMS Values Using and

Recall Average Power Power Factor Power factor Power factor angle Note that Thus, an industrial load that consumes P watts with a high PF from a V rms volt line will have lower line losses.

Complex Power Real, average power Imaginary, quadrature power

Residential Power Systems Read Section 5-8, pages

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