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AC Theory ch 28

Power Factor

QuestionAnswer
1. Assume a pure inductive circuit and answer the following. a. Current will ___ the voltage by ___ degrees. Lag 90
b. Draw a sine wave showing current and voltage draw
c. The true power used or consumed in this circuit is ____ watts. zero
d. What is the power factor of this circuit. 0% page 138
2. Assume a pure capacitive circuit and answer the following. a. Current will ___ the voltage by ___ degrees. Lead 90
b. Draw a sine wave showing voltage and current. draw
c. The true power used or consumed in the circuit is ____ watts. zero
d. What is the power factor of this circuit? 0%
3. Assume a pure resistive circuit and answer the following. a. What phase relationship eists between voltage and current? in phase
b. Draw a sine wave showing voltage and current. draw
c. What percent of apparent power is used in the circuit? 100%
d. What is the power factor of the circuit? 100%
4. The addition of resistance to a reactive series circuit always _____(increases/decreases) the phase angle decreases
5. The addition of resistance to a reactive series circuit always ____(increases/decreases) the power factor of the circuit. increases
6. Circuits that contain both resistance and reactance must have a power factor somewhere between ____ and ____ percent and a phase angle between ___ and ___ degrees. 0% and 100% 0% and 90%
7. As the phase angle is decreased, the power factor is _____. increased
8. How do you find apparent power in an AC circuit? State formula P = ET x IT
9. True power is dissipated as ____. Heat
10. Complete the following formulas: a. PF = True Power/ ?????? Apparent Power
b. PF = ?????/Volt-amperes Watts
c. PF= _____theta Cos
d. PF = R/______ (Series Circuit) no answer given
e. PF = kW/???? KVA
11. Define power factor ration of true power to apparent power. True/Apparent
12 Complete the following formulas a. VA = ?????/PF Watts
b. W = E x I x ________ Cos of theta
c. W = ????? x PF VA
13. and 14. see page 395 for questions
Created by: JoshHampton
 

 



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