Deck 5: Series Circuits

Question 1

The total resistance of three parallel resistors equals the sum of the individual resistor values.

Answer 1

False

Question 2

Kirchhoffʹs Current Law states that the sum of the currents into a junction must equal the sum of
the currents out of that junction.

Answer 2

True

Question 3

If three equal resistors are connected in parallel across 12 V, each resistor drops 4 V.

Answer 3

False

Question 4

If resistor and a resistor are connected in parallel, RT equals ________.

A)
B)
C)
D)

Question 5

The total power dissipated by a parallel circuit can be found by adding the individual powers.

Question 6

If twelve resistors are connected in parallel across 50 V, RT equals ________.

A)
B)
C)
D)

Question 7

A parallel circuit can be easily identified because only one end of each component is connected to
each other.

Question 8

in a parallel circuit.

Question 9

If mA in a two branch parallel circuit, mA.

Question 10

If a resistor are connected in parallel across a 25 V source, how much current flows through the 1 esistor?

A)20.8 mA
B)2.5 mA
C)50 mA
D)2.4 mA

Question 11

If a resistor, resistor and resistor are connected in parallel across an 18 V source, what is the total current if the 1 resistor opens?

A)
B)74.3 mA
C)92.3 mA
D)

Question 12

In a three-resistor parallel circuit, then what is the value of

A)
B)
C)
D)

Question 13

If one branch of a parallel circuit shorts, the total resistance decreases.

Question 14

Measurement of total current is accomplished with the ammeter in series with the source voltage.

Question 15

If mA in a two branch parallel circuit,

Question 16

If a resistor are connected in parallel, what is

A)
B)
C)
D)

Question 17

Accurate troubleshooting of a parallel circuit cannot be performed with a voltmeter.

Question 18

The total resistance of four resistors in parallel is always less than the smallest resistance.

Question 19

If one branch of a parallel circuit opens, the total resistance decreases.

Question 20

Total power for a parallel circuit can be determined by the same method as a series circuit.

Question 21

If you measure a lower than normal total current in a parallel circuit, ________.

A)all of the resistors are opened
B)a resistor opened
C)the power supply is off
D)a resistor shorted

Question 22

Each branch in a four-branch parallel circuit carries 10 mA. If one of the branches opens, then the current in each of the other three branches equals ________.

A)0 A
B)30 mA
C)13.33 mA
D)10 mA

Question 23

If one resistor opens in a parallel circuit, the total circuit resistance ________ and the total circuit current ________.

A)decreases, increases
B)decreases, decreases
C)increases, increases
D)increases, decreases

Question 24

If four 100 W lamps are connected in parallel across a 120 V source, what is the total current?

A)33.3 A
B)833 mA
C)8.33 A
D)3.33 A

Question 25

If a resistor, resistor and resistor are connected in parallel, what is the approximate value for ?

A)
B)
C)
D)

Question 26

If you want to measure a load voltage with a DVM, connect the meter ________.

A)across the source
B)in parallel with the load
C)in series with the load
D)in series with the source

Question 27

A formula that applies to a two-branch parallel circuit is ________.

A)
B)
C)
D)

Question 28

The current through any branch of a parallel circuit ________.

A)is directly proportional to the branch resistance
B)depends on the power rating of the resistor
C)depends only on the circuit voltage
D)is inversely proportional to the branch resistance

Question 29

If the power dissipation in each of four parallel branches is 1 W, equals ________.

A)1 W
B)4 W
C)0 W
D)0.25 W

Question 30

If one resistor shorts in a parallel circuit, the total current ________.

A)increases
B)equals 0 A
C)decreases
D)decreases momentarily, then returns to the original value

Question 31

If three resistors are connected in parallel across a 10 V source, equals ________.

A)22.6 m W
B)4.5 m W
C)13.6 m W
D)18.1 m W

Question 32

If there is 100 mA of current flowing into a three-branch parallel circuit and two of the branch currents are 40 mA and 20 mA, the third branch current is ________.

A)20 mA
B)40 mA
C)60 mA
D)160 mA

Question 33

As additional branch resistors are connected in a parallel circuit, ________.

A) decreases and increases
B) increases and R increases
C) decreases and decreases
D) increases and ecreases

Question 34

If a resistor, a resistor and a resistor are connected in parallel across a 50 V source, what is the current through the resistor?

A)4.72 mA
B)15.15 mA
C)9.21 mA
D)10.64 mA

Question 35

IT equals 0.1 mA in a 3-branch parallel circuit. ?

A)0.029 mA
B)0.071 mA
C)0.213 mA
D)0.142 mA

Question 36

A two-branch parallel circuit contains these values: . What is the value of V

A)2.4 m V
B)3.6 m V
C)6 m V
D)18 m V

Question 37

If 5 A and 3 A enter a junction from two separate paths, how much current flows out of the junction?

A)3 A
B)8 A
C)2 A
D)the larger of the two

Question 38

If a resistor, resistor and resistor are connected in parallel, the total resistance equals ________.

A)
B)
C)
D)

Question 39

The total resistance of a three-branch parallel circuit is what is the value of ?

A)
B)
C)
D)

Question 40

in a two-branch parallel circuit. What is the value of ?

A)
B)
C)
D)

Question 41

An open in one branch of a parallel circuit results in:

A)decreased or reduced current flow.
B)decreased power consumption.
C)increased circuit resistance.
D)all of these.

Question 42

To measure the current through one branch of a parallel circuit, the meter is connected ________.

A)in series with the source
B)in parallel with the branch resistor
C)in series with the branch resistor
D)across the source

Question 43

If three 75 W lamps are connected in parallel across a 125 V source, IT equals ________.

A)1.8 A
B)180 mA
C)18 A
D)18 mA

Question 44

If one resistor opens in a parallel circuit, the total current ________.

A)decreases
B)increases
C)varies wildly
D)remains unchanged

Question 45

If eight resistors are connected in parallel across a 25 V source, RT equals ________.

A)
B)
C)
D)

Question 46

Refer to Figure 5-1. The voltage across R2 is 0 V. What is most likely the problem?

A)R2 open
B)fuse open
C)R1 open
D)none of the above

Question 47

In a parallel circuit, the largest amount of power is dissipated by:

A)the first resistor.
B)the largest resistor.
C)the smallest resistor.
D)any resistor, since the voltage is the same across each of the branch circuits.

Question 48

The most popular application for a parallel circuit in electronics is as a:

A)voltage divider.
B)resistance divider.
C)current divider.
D)power divider.

Question 49

A three-branch parallel circuit carries a total current of 1.2 mA. If mA, then what is the value of

A)2.4 mA
B)8.7 mA
C)7.2 mA
D)0.3 mA

Question 50

The power dissipated by any branch of a parallel circuit ________.

A)depends on the power rating of the resistor
B)only depends on the circuit voltage
C)depends on the voltage and value of the resistor
D)only depends on the total current

Question 51

A resistor, resistor and resistor are connected in parallel across a 15 V source. What is the total current if the resistor opens?

A)
B)
C)
D)

Question 52

If a resistor and resistor are connected in parallel, the total resistance is ________.

A)
B)2200 Ω
C)
D)less than 2200 Ω

Question 53

If a resistor, resistor and resistor are connected in parallel, the total resistance equals ________.

A)
B)
C)
D)

Question 54

If the in a two-branch parallel circuit, what is the value of ?

A)
B)
C)
D)

Question 55

In a parallel circuit, total power is calculated as:

A)
B)
C)
D)

Question 56

As resistors are disconnected from a parallel circuit, ________.

A) increases and decreases
B) decreases and decreases
C) increases and increases
D) ecreases and increases

Question 57

If three resistors are connected in parallel across a 12 V source, what is the value of ?

A)141 mW
B)14.1 mW
C)91.9 mW
D)1.41 W

Question 58

A short in one branch of a parallel circuit results in:

A)increased circuit resistance.
B)decreased power consumption.
C)increased voltage drops in the remaining branches.
D)increased current flow.

Question 59

In a three-branch parallel circuit, Calculate

A)
B)
C)
D)

Question 60

If the total current equals 0 A in a four-branch parallel circuit, the trouble is that ________.

A)three of the resistors have opened
B)one of the resistors has shorted
C)one resistor has opened
D)the power supply is off

Question 61

Refer to Figure 5-1. The fuse in this circuit is rated at 100 mA. Would the fuse blow if an additional 1 kΩ were placed in parallel with R5?

A)no
B)yes
C)Fuse has nothing to do with this part of the circuit.

Question 62

Refer to Figure 5-1. What is the power dissipation of R3?

A)11.4 mW
B)284 mW
C)25 mW
D)568 mW

Question 63

Refer to Figure 5-1. To accurately measure the total current for this circuit, how must the ammeter be connected?

A)between the negative terminal and the supply and ground
B)between R1 and the fuse
C)between the positive terminal and the fuse
D)either A or C

Question 64

Refer to Figure 5-1. The total current for this circuit is measured and the ammeter reads 57.8 mA. What is the problem, if any?

A)R3 open
B)R1 open
C)R2 open
D)This is normal.