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e e 2315 - PowerPoint PPT Presentation

E E 2315. Lecture 15 Phasor Circuit Analysis, Effective Value and Complex Power: Watts, VAR’s and Volt-Amperes. Effective Value of a Sinusoid (1/2). Average Power:. Effective Value of a Sinusoid (2/2). In our example:. Also:. The effective value is also called the Root Mean

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E E 2315

Lecture 15

Phasor Circuit Analysis, Effective Value and Complex Power: Watts, VAR’s and Volt-Amperes

Average Power:

In our example:

Also:

The effective value is also called the Root Mean

Square value or rms value.

Capacitive Reactance

Using rms phasor for voltage source.

Calculate Real Power:

And Reactive Power:

Apparent power is the product of voltage and

current of the source.

Also:

Power Factor is the ratio of real power to

apparent power:

Power Factor is also the Cosine of the angle

the power factor is lagging.

Phasor Diagram of Voltage and Current

power factor.

From now on, we use the above method

to calculate complex power.

Calculate complex power directly:

Power Factor:

Power Factor is Lagging

Phasor Diagram of Voltage and Current

Power Triangle for lagging Power Factor

Capacitor VAR’s: