Apparent Power

Electrical Science Volume 3 of 4
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POWER TRIANGLE Basic AC Power Figure 1 Power Triangle The power triangle represents comparable values that can be used directly to find the efficiency level of generated power to usable power, which is expressed as the power factor (discussed later). Apparent power, reactive power, and true power can be calculated by using the DC equivalent (RMS value) of the AC voltage and current components along with the power factor. Apparent Power Apparent power (S) is the power delivered to an electrical circuit. Equation (9-1) is a mathematical representation of apparent power. The measurement of apparent power is in volt- amperes (VA). S = I²Z = I_TE (9-1) where S = apparent power (VA) I = RMS current (A) E = RMS voltage (V) Z = impedance (W) ES-09 Page 2 Rev. 0

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