AC Theory Level 2: Understanding and
working with parallel RL Circuits Exam
Study Guide | Latest Edition
1. A parallel RLC circuit must contain at least three branches. - ANSWER
True
For example
Br1 `- L
Br2 - C
Br3 - R
6Q1
2. In parallel RLC circuits, the ? is the same and is ? phase across all branches
and is used as the main reference
for calculations. - ANSWER voltage / in
Note: This question references only the phase relationship with ET, ER, EL,
and EC.
6Q2
3. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
,What is the true power of the circuit shown? - ANSWER P_true_ = e * I_R_
= 120 * 12
= 1,440 W
6Q11
4. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
Solve for the net reactive current (I_X_). - ANSWER I_X_ = I_L_ - I_C_
=14 - 6
=8A
6Q12
5. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
Solve for the reactive power (vars). - ANSWER P_reactive_ = E * ( I_L_ -
I_C_)
=120 * (14-6)
=960 var
, 6Q13
6. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
Solve for the apparent power (VA). - ANSWER 1731 VA
6Q14
7. Given a -45 degree power triangle.
What side is adjacent?
Opposite?
Hypotenuse? - ANSWER Adj = 1440W
Opp = 960var
Hyp = 1731VA
6Q15
8. True or False
The formula I_T_ = sqrt ( I_R_^2 = (I_L_ -I_C_)^2 ) can be used to find total
current in a parallel RLC circuit using branch currents. - ANSWER True
6Q16
working with parallel RL Circuits Exam
Study Guide | Latest Edition
1. A parallel RLC circuit must contain at least three branches. - ANSWER
True
For example
Br1 `- L
Br2 - C
Br3 - R
6Q1
2. In parallel RLC circuits, the ? is the same and is ? phase across all branches
and is used as the main reference
for calculations. - ANSWER voltage / in
Note: This question references only the phase relationship with ET, ER, EL,
and EC.
6Q2
3. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
,What is the true power of the circuit shown? - ANSWER P_true_ = e * I_R_
= 120 * 12
= 1,440 W
6Q11
4. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
Solve for the net reactive current (I_X_). - ANSWER I_X_ = I_L_ - I_C_
=14 - 6
=8A
6Q12
5. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
Solve for the reactive power (vars). - ANSWER P_reactive_ = E * ( I_L_ -
I_C_)
=120 * (14-6)
=960 var
, 6Q13
6. Given a simple rlc crkt
E = 120 V
F = 60 Hz
I_L_ = 14 A
I_C_ = 6 A
I_R_ = 12 A
Solve for the apparent power (VA). - ANSWER 1731 VA
6Q14
7. Given a -45 degree power triangle.
What side is adjacent?
Opposite?
Hypotenuse? - ANSWER Adj = 1440W
Opp = 960var
Hyp = 1731VA
6Q15
8. True or False
The formula I_T_ = sqrt ( I_R_^2 = (I_L_ -I_C_)^2 ) can be used to find total
current in a parallel RLC circuit using branch currents. - ANSWER True
6Q16
