Delmar 6
In a parallel circuit, ET = 240 V, R = 27 kΩ, and XL = 47 kΩ. What is IT?
3.24 mA
In a parallel circuit, ET = 240 V, R = 30 Ω, and XL = 40 Ω. What is IT?
3.43A
A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω. The inductors have inductive reactances of 60 Ω and 30 Ω. The applied voltage is 120 V. What is the voltage drop on the 33 Ω resistor?
32.89 V
In a parallel circuit, ET = 120 V, R = 3.3 kΩ, and XL = 4 kΩ. What is IR?
36.36mA
7299Which of these formulas would be used to calculate total current?
A
Which of these formulas applies to resistive current?
A
Which of these formulas is used to calculate the amount of inductance?
B
nductive quantity and circuit total quantity can be used with Ohm's law to find resistive quantities.
False
In a resistive-inductive parallel circuit, the voltage applied to any device in parallel must be ______.
The Same
Of the different power values in an RL circuit, which one is known as quadrature power?
VARs
Of the different power values in an RL circuit, which one is known as wattless power?
VARs
The total current-limiting effect is called _____.
impedance
Circuits are generally considered to contain _____ when any type of load that contains a coil is used.
inductance
A ceiling fan has a light kit attached to the fan. What type of load is the ceiling fan?
inductive
Before it is possible to calculate the impedance of the circuit, the total amount of _____________ for the circuit must be found.
inductive reactance
Which of the following is an inductive quantity?
inductive reactance
What is needed to calculate the amount of induced voltage in an inductor?
resistance of the wire in the coil and amount of circuit current
The amount of phase angle shift between the total circuit current and voltage is determined by the ratio of the amount of __________ to the amount of _____________.
resistance, inductance
The total inductive reactance of inductors connected in series equals the sum of the inductive reactance for all the inductors.
true
In a series RL circuit, ET = 120 V, R = 500 Ω, and XL = 500 Ω. What is the true power?
14.4W
Watts can be calculated by multiplying the total voltage by the current flow through the resistor.
false
An inductor has an inductive reactance of 12 Ω, and a wire resistance of 16 Ω. What is the impedance of the inductor?
20 Ω
In a parallel circuit, ET = 208 V, R = 39 kΩ, and XL = 24 kΩ. What is the power factor?
52.4%
In a pure inductive circuit, the current _____.
lags voltage by 90°
What does the above diagram represent?
nductors connected in series
True power for the circuit can be calculated by using any of the watts formulas with pure resistive parts of the circuit.
true
In a parallel circuit, ET = 120 V, R = 1500 Ω, and XL = 1000 Ω. What is the apparent power?
17.31 VA
Two inductors are connected in parallel to a 120-V, 60-Hz supply. The values of the inductors are 0.15 H and 0.225 H. The total inductive reactance is _____.
3.54 A
In a series RL circuit ET = 120 V, R = 150 Ω, and XL = 270 Ω. What is the reactive power?
40.75 VARs
For circuits that contain a __________, inductance is considered in circuit calculations, such as transformers and chokes.
coil
Both inductive reactance and impedance are measured in ohms.
true
The relationship of volt-amperes, watts, and VARs is the same for an R-L parallel circuit as it is for an R-L series circuit.
true
n increase of frequency causes the magnetic lines of flux to cut the conductors at a faster rate and thus produces a higher induced voltage or more inductive reactance.
true
In a parallel circuit, ET = 277 V, R = 33 kΩ, and XL = 42 kΩ. What is Z?
25.95 kΩ
In a parallel circuit, ET = 240 V, R = 330 Ω, and XL = 420 Ω. What is Z?
259.62 Ω
In a parallel circuit, ET = 120 V, R = 30 Ω, and XL = 60 Ω. What is the phase angle (angle theta)?
26.51°
In a parallel circuit, ET = 120 V, R = 470 Ω, and XL = 500 Ω. What is the reactive power?
28.8 VARs
In a series RL circuit, ET = 120 V, R = 30 Ω, and XL = 40 Ω. What is the apparent power?
288 VA
Two inductors are connected in parallel to a 120-V, 60-Hz supply. The values of the inductors are 1.5 H and 2.5 H. The total inductive reactance is _____.
533.49 Ω
Assume an inductor is connected to a 180-V AC line and the inductor has an induced voltage of 120 V. How many volts are there to push current through the wire resistance of the coil?
60
In a series RL circuit, ET = 120 V, R = 40 Ω, and XL = 30 Ω. How much is EL?
72V
A series RL circuit contains two resistors. The resistors are 33 Ω and 47 Ω. When calculating the circuit values, the total resistance used is _____.
80 Ω
7304Which of these formulas would be used to calculate inductive current?
Il=E/Xl
he symbol for reactive power of an inductor is _____.
VARs
What does a schematic symbol that is used to represent an inductor depict?
a coil of wire
In a parallel circuit, the voltage across the resistor and the voltage across the inductor are _____.
in phase
Because the voltage and current are 90° out of phase with each other in a pure inductive circuit, the current and voltage will be at different polarities 50% of the time.
true
In a pure resistive AC circuit, the voltage and current are in phase with each other.
true
In a series circuit, the current is the same at any point in the circuit.
true
In an R-L parallel circuit, power factor can be calculated by dividing the current flow through the resistive parts of the circuit by the total circuit current.
true
In an R-L parallel circuit, the value of impedance can be found if total current and voltage are not known.
true
One of the primary laws of series circuits is that the current must be the same in any part of the circuit.
true
The apparent power can be calculated by multiplying the circuit voltage by the total current flow.
true
In a parallel circuit, ET = 208 V, R = 33 kΩ, and XL = 82 kΩ. What is the apparent power?
1.41 VA
Two inductors are connected in series to a 120-V, 60-Hz supply. The values of the inductors are 0.175 H and 0.255 H. The total circuit current is _____.
0.74 A
In a parallel circuit, ET = 240 V, R = 47 kΩ, and XL = 50 kΩ. What is the reactive power?
1.15 VARs
A series RL circuit contains two resistors and two inductors. The resistors are 43 Ω and 54 Ω. The inductors have inductive reactances of 70 Ω and 40 Ω. The total impedance is _____.
146.66 Ω
A series RL circuit contains two resistors and two inductors. The resistors are 27 Ω and 47 Ω. The inductors have inductive reactances of 50 Ω and 40 Ω. The applied voltage is 120 V. What is the voltage drop on the inductor that has 40 Ω of reactance?
41.2 V
A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω. The inductors have inductive reactances of 60 Ω and 30 Ω. Angle theta is _____.
48.37°
In a parallel circuit, ET = 120 V, R = 30 Ω, and XL = 40 Ω. What is IR?
4A
In a parallel circuit, the current flow through the inductor will be _____.
90° out of phase with the voltage
In a series RL circuit, ET = 120 V, R = 40 Ω, and XL = 30Ω. What is ER?
96V
What is the angular displacement by which the voltage and current are out of phase with each other?
Angle theta
When calculating circuit values, how is total circuit current represented?
IR
In an R-L parallel circuit, the angle theta is the angle produced by the apparent power and the true power.
True
When magnetic lines of flux cut through a coil, a voltage is induced in the coil.
True
When the current and voltage are opposite in polarity, power is given back to the circuit as the magnetic field collapses and induces a voltage back into the circuit.
True
In a pure inductive circuit, the wattage is equal to the product of the voltage and current.
false
In an R-L parallel circuit, vectors can be used to plot the impedance because the values of resistance and inductive reactance add the same as they do in a series circuit.
false
In an R-L series circuit, the current is not the same through both the resistor and the inductor.
false
power factor cannot be determined by using the impedance and resistance.
false
n practice, the resistive part of the circuit and the reactive part of the circuit are ___________ with each other by 90°.
out of phase
The amount of resistance compared with the inductive reactance determines the _____ of the coil.
quality (Q)
In a series circuit, the total _____ is equal to the sum of the individual resistors.
resistance
When inductors are connected in __________, the total inductance of the circuit equals the sum of the inductances of all the inductors.
series
