Deck 6: Parallel Circuits

Question 1

If R₃ opens in Figure 6-1, VR₁ ________.

A)decreases
B)remains the same
C)decreases to zero
D)increases

Answer 1

decreases

Question 2

If two resistors are in parallel, they carry the same current.

Answer 2

False

Question 3

R₁ is in series with the series combination R₂ and R₃ in Figure 6-1.

Answer 3

False

Question 4

Thevinizing a circuit creates an equivalent series circuit.

Question 5

Maximum power is achieved when the load resistance is approximately two times the source
resistance.

Question 6

Two or more resistors connected in series form a circuit known as a voltage divider.

Question 7

If in Figure 6-1, the total resistance equals ________.

A)
B)
C)
D)

Question 8

If two resistors are in parallel, they drop the same voltage.

Question 9

A bridge circuitʹs resistances must all be of the same value to be in a balanced condition.

Question 10

A loaded voltage divider is a series-parallel circuit.

Question 11

In Figure 6-1, R₂ is connected in ________.

A)series with R₃
B)parallel with R₁
C)parallel with R₃
D)series with R₁

Question 12

R₁ is in series with R₃ in Figure 6-1.

Question 13

A series-parallel circuit consists of resistors in both series and parallel.

Question 14

A voltmeter, when connected across a component, can be viewed as being a resistor in series with
that component.

Question 15

In Figure 6-1, R1 is connected in ________.

A)series with R₂
B)parallel with R₂
C)parallel with R₃
D)series with R3
E)none of the above

Question 16

The voltage across any open in a series-parallel circuit will be the source voltage.

Question 17

If in Figure 6-1, PR2 equals ________.

A)7.64 mW
B)2.30 mW
C)8.63 mW
D)18.6 mW

Question 18

No problems could occur if a 10 V source and a 20 V source were connected in parallel.

Question 19

R₂ is in parallel with R₃ in Figure 6-1.

Question 20

R₁ is in series with the parallel combination R₂ and R₃ in Figure 6-1.

Question 21

If in Figure 6-1, equals ________.

A)75.7 mA
B)9.15 mA
C)12.1 mA
D)8.8 mA

Question 22

If V in Figure 6-3, what is the value of VAD?

A)10 V
B)30 V
C)40 V
D)20 V

Question 23

If R4 shorts in Figure 6-2, VR5 ________.

A)decreases to zero
B)decreases
C)increases
D)remains the same

Question 24

If all of the resistors in Figure what is the value of R

A)
B)
C)
D)

Question 25

If all resistors equal and equals 20 V in Figure 6-2, what is the value of

A)1.06 mA
B)0.53 mA
C)11.99 mA
D)12.5 mA

Question 26

If in Figure 6-2, what is the value of

A)
B)
C)
D)

Question 27

If in Figure 6-1, equals ________.

A)1.16 mA
B)1.58 mA
C)2.17 mA
D)2.5 mA

Question 28

In Figure 6-2, R3 and are connected in ________.

A)
B)parallel with each other
C)
D)

Question 29

If = 22 V in Figure 6-3, what is the is the value of

A)-11 V
B)-22 V
C)11 V
D)5.5 V

Question 30

If = 12 V in Figure 6-3, what is the value of shorts?

A)-3 V
B)8 V
C)6 V
D)-8 V

Question 31

If in Figure 6-1, equals ________.

A)
B)
C)
D)

Question 32

If Vs = 15 V and every resistor equals in Figure 6-2, what is the value of

A)5.11 mA
B)2.55 mA
C)0.85 mA
D)0.42 mA

Question 33

In Figure 6-2, are connected in ________.

A)
B)series with each other
C)
D)

Question 34

If R1 shorts in Figure 6-2, VR4 ________.

A)
B)remains the same
C)increases
D)decreases

Question 35

If a resistor is placed in parallel with in Figure 6-3, how will change?

A) will remain the same.
B) will decrease.
C) will increase.
D) will change to 4 volts.

Question 36

If opens in Figure 6-2,

A)causes the fuse to blow
B)decreases
C)remains the same
D)increases

Question 37

In Figure 6-2 if ?

A)
B)
C)
D)

Question 38

If R3 shorts in Figure 6-2, ________.

A)remains the same
B)decreases
C)increases

Question 39

What is the resistance between points B and E in Figure 6-3?

A)
B)
C)
D)

Question 40

If every resistor in Figure 6-2 equals what is the value of

A)
B)
C)
D)

Question 41

Power in a series-parallel resistor circuit is dissipated as:

A)current flow.
B)voltage loss.
C)resistance change.
D)heat.

Question 42

If four parallel resistors are connected in series with a single resistor and one of the parallel resistors opens, how does the voltage across the other parallel resistors change?

A)It increases.
B)It remains the same.
C)It decreases.

Question 43

In solving series-parallel circuits, the last and easiest to solve for is:

A)RT.
B)PT.
C)IT.
D)ET.

Question 44

If = 50 V in Figure 6-3, what is the value of

A)25 V
B)-25 V
C)-5 V
D)5 V

Question 45

Two series resistors are connected in parallel with a resistor. If the voltage across one of the resistors is 6 V, what is the voltage across the resistor?

A)3 V
B)12 V
C)6 V
D)13.2 V

Question 46

The parallel combination of a resistor and a resistor is connected in series with the parallel combination of four resistors. If a 100 V source is connected across the circuit, then
Which resistor carries the most current?

A)
B)
C)

Question 47

If = 40 V and R3 opens in Figure 6-3, what is the value of

A)40 V
B)30 V
C)0 V
D)20 V
E)10 V

Question 48

The parallel combination of a resistor and a resistor is connected in series with the parallel combination of four resistors. If a 100 V source is connected across the circuit, then
Which resistor drops the most voltage?

A)
B)
C)

Question 49

If V = 17 V in Figure 6-3, what is the value of

A)2.89 W
B)1.7 mW
C)28.9 mW
D)17 mW

Question 50

In solving series-parallel circuits using Ohmʹs law, first solve for:

A)the series resistance.
B)the parallel current.
C)the series current.
D)the parallel resistance.

Question 51

If four parallel resistors are in series with a single esistor and one of the parallel resistors shorts, the voltage across the other parallel resistors ________.

A)decreases
B)remains the same
C)increases

Question 52

If the current is 1.2 mA in Figure 6-3, what is the value of

A)576 mW
B)5.76 mW
C)0.576 mW
D)57.6 mW

Question 53

If a fifth resistor is connected in series in Figure 6-3, how does change?

A) decreases.
B) remains the same.
C) increases to 10 V.
D) increases.

Question 54

In a two-source circuit, one source alone produces 10 mA through a branch. If the other source alone produces 8 mA in the opposite direction through the same branch, what is the total current
Through the branch?

A)8 mA
B)18 mA
C)10 mA
D)2 mA

Question 55

In solving series-parallel circuits using Ohmʹs law, first solve for:

A)ET.
B)IT.
C)RT.
D)any of these, it doesnʹt matter.

Question 56

If the current is 12 mA in Figure 6-3, what is the value of

A)240 V
B)-360 V
C)-240 V
D)360 V

Question 57

What is the resistance between points A and D in Figure 6-3?

A)
B)
C)
D)

Question 58

One Ohmʹs law formula can be used to solve for total power in:

A)series-parallel circuits.
B)series circuits.
C)parallel circuits.
D)all of these.

Question 59

If a voltage divider consists of two resistors, which one of these load resistors will change the output voltage the most?

A)
B)
C)
D)

Question 60

If = 15 V in Figure 6-3, what is the value of

A)-60 V
B)60 V
C)30 V
D)-30 V

Question 61

Theveninʹs theorem provides a method for:

A)designing complex series-parallel circuits.
B)simplifying complex series-parallel circuits.
C)building complex series-parallel circuits.
D)all of these.

Question 62

The difference between a balanced and an unbalanced Wheatstone bridge is measured by:

A)an ammeter.
B)a voltmeter.
C)a galvanometer.
D)an ohmmeter.

Question 63

The Wheatstone bridge circuit is widely used to measure:

A)precise resistances.
B)accurate currents.
C)exact voltages.
D)all of these.

Question 64

In the parallel portion of series-parallel circuits, the total resistance is:

A)greater than the largest resistance.
B)less than any one resistance.
C)equal to the smallest resistance.
D)less than the smallest resistance.

Question 65

Refer to Figure 6-4. If R1 is changed to the Thevenin resistance and voltage would be:

A)595 and 3 V.
B)1 k and 807 mV.
C)595 and 807 mV.
D)1 k and 3 V.

Question 66

Refer to Figure 6-5. If all of the resistors of this circuit are and are 10 V but opposing polarities, what would be the current flow through R2?

A)2.66 mA
B)13.33 mA
C)0 A
D)1.33 mA

Question 67

In the series portion of series-parallel circuits, the total resistance is:

A)less than any one resistance.
B)equal to the largest resistance.
C)less than the largest resistance.
D)greater than the largest resistance.

Question 68

According to the maximum power transfer theorem, maximum power is delivered to any load when the load resistance is:

A)larger than source resistance.
B)at least twice or more than the source resistance.
C)less than one-half of the source resistance.
D)exactly equal to the source resistance.

Question 69

Refer to Figure 6-4. With circuit balanced there is:

A)Cannot be determined without detailed analysis.
B)maximum current flow through the load.
C)no current flow through the total circuit.
D)no current through the load.

Question 70

The super position theorem provides a method for:

A)designing complex series-parallel circuits.
B)building complex series-parallel circuits.
C)analyzing complex series-parallel circuits.
D)all of these.

Question 71

Refer to Figure 6-4. What approximate R1 resistor value would it take to balance this bridge circuit?

A)
B)
C)
D)

Question 72

Refer to Figure 6-5. Determine the amount of current flow through with the following component parameters.

A)5.3 mA
B)1 mA
C)1.37mA
D)0 A