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REFERENCES - h1011v3_64
POWER TRIANGLE

Electrical Science Volume 3 of 4
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Basic AC Power OBJECTIVES TERMINAL OBJECTIVE 1.0 Given an AC single-phase or three-phase circuit, DESCRIBE the power characteristics in the circuit. ENABLING OBJECTIVES 1.1 DESCRIBE the relationship between apparent, true, and reactive power by definition or by using a power triangle. 1.2 DEFINE power factor as it relates to true power and apparent power. 1.3 Given the necessary values for voltage (E), resistance (R), reactance (X), impedance (Z), and/or current (I), CALCULATE the following power components for an AC circuit: a. True power (P) b. Apparent power (S) c. Reactive power (Q) d. Power factor (pf) 1.4 DEFINE the following terms: a. Leading power factor b. Lagging power factor 1.5 STATE the reasons that three-phase power systems are used in the industry. 1.6 Given values for current, voltage, and power factor in a three-phase system, CALCULATE the following: a. Real power b. Reactive power c. Apparent power 1.7 Given a diagram of a wye- or delta-connected three-phase system, DESCRIBE the voltage/current relationships of the circuit. 1.8 STATE the indications of an unbalanced load in a three-phase power system. Rev. 0 Page v ES-09







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