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Complex Power

Complex Power . Designate as S Magnitude of S = Apparent Power Units are Volt-Amperes The complex sum of Real Power (P) and Reactive Power (Q). Graphical Interpretation of S Power Triangle . Summary. Summary -- 2. Apparent Power – the volt-amp capacity required to supply P.

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Complex Power

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  1. Complex Power • Designate as S • Magnitude of S = Apparent Power • Units are Volt-Amperes • The complex sum of Real Power (P) and Reactive Power (Q) ECE 201 Circuit Theory I

  2. Graphical Interpretation of SPower Triangle ECE 201 Circuit Theory I

  3. ECE 201 Circuit Theory I

  4. Summary ECE 201 Circuit Theory I

  5. Summary -- 2 Apparent Power – the volt-amp capacity required to supply P Q = Power exchanged between source and load P = Useful Output from the device being powered (Watts) ECE 201 Circuit Theory I

  6. Summary -- 3 If the power factor angle is = 0, Apparent Power = Average Power (and Reactive Power = 0). ECE 201 Circuit Theory I

  7. Example 10.4 Calculating Complex Power • An electrical load operates at 240 V rms. The load absorbs an average power of 8 kW at a lagging power factor of 0.8. • Calculate the complex power of the load. • Calculate the impedance of the load. ECE 201 Circuit Theory I

  8. The power factor is “Lagging”, so we have an inductive load. The Reactive Power, Q, is Positive. ECE 201 Circuit Theory I

  9. ECE 201 Circuit Theory I

  10. ECE 201 Circuit Theory I

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