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AC Theory

Lesson 18

QuestionAnswer
A resistor and an inductor are connected in parallel. The voltage across the resistor is 120 Volts. What is the voltage across the inductor? What is the phase relationship between the two voltages? 120 V in phase
In a series RL circuit, the ____ is in-phase, and ____ are out-of-phase. In a parallel RL circuit, the ____ are in-phase, and the ____ are out-of-phase. current, voltage voltage, current
Two resistors are connected in parallel. One has current flow of 2 amperes and the other draws 4 amperes. What is the total current? 2 + 4= 6 A
The current through the resistive branch of a parallel circuit is ____ degree(s) out-of-phase with the current through the inductive branch. 90°
The impedance of a parallel RL circuit is always ____ (more/less) than the resistance or reactance of any one branch. less
The ____ (true/apparent/reactive) power can be computed by multiplying the line voltage by the line current. apparent
The power factor (PF) in an RL parallel circuit is the ratio of ____ to ____. volt-amps watts
A circuit has an applied voltage of 240 volts and draws 5 amperes. The power factor is 70%. What is the apparent power? What is the true power? Apparent power: VA=240 x 5 =1200VA True power: .7=TP/1200 x 100= 840 Watts
If the frequency of a parallel RL circuit is increased: Z increases Θ decreases
In a series RL circuit, the vector sum of the currents equals the total current. False
In a series RL circuit, power delivered by the source is apparent power. true
In a parallel RL circuit, power delivered by the source is apparent power. true
When the resistance of a parallel RL circuit is increased, the circuit becomes more inductive. true
When the resistance of a series RL circuit is increased, the circuit becomes more inductive. false
When the inductance of a series RL circuit increases, Θ increases. true
In a parallel RL circuit, the voltage across each branch is the same. true
The current is the same at all points in a parallel RL circuit false
Created by: SM76502
 

 



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