Lesson 19 Flashcards
The impedence of a parallel RL circuit is always_______ than the resistance or reactance of any one branch.
Less
The_______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 ______
Watts/VA
A circuit has an applied voltage of 240 volts and draws 5 amperes. The power factor is 70%. A) what is the apparent power?
B) what is the true power?
A) 1200 VA IxE
B) IxExPf 840 watts
If the frequency of a parallel circuit is increased:
Z increases
Angle theta 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 tge 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, angle theta 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
Current in the capacitive branch is in phase with the voltage.
False
The current in the resistive branch is in phase with the voltage
True
Current in the capacitive branch leads current in the resistive branch by 90 degrees
True
Voltages across the resistive and capacitive branches are 90 degrees out of phase
False
Total current times applied voltage gives the ________ power
Apparent
In any reactive circuit which is larger: true power or apparent power?
Apparent power
When is true power equal to apparent power?
Only in a completely resistive circuit
If the frequency of a parallel RC circuit is increased
The It increases
Xc decreases
Phase angle increases
Power factor decreases
