Deck 4: Series Circuits

Question 1

Total power dissipated in a series circuit equals source voltage multiplied by current.

Answer 1

True

Question 2

Calculate V_R2 and V_R3 in Figure 4-1 if V_R1=16V, R₁=10 , R₂=10 and R₃=15

A) V_R2=16 V, V_R3=12 V
B) V_R2=16 V, V_R3=24 V
C) V_R2=24 V, V_R3=12 V
D) V_R2=16 V,V_R3=16 V

Answer 2

V_R2=16 V, V_R3=24 V

Question 3

If a 1/4W resistor and a 1/2W resistor areW ired in series, they can safely dissipate 3/4W .

Answer 3

False

Question 4

In a series circuit, the current is the same at every point in the circuit.

Question 5

Calculate VT in Figure 4-1 if VR1=16 V, R₁=10, R₂=10 and R₃=15

A) 24 V
B) 16 V
C) 56 V
D) 112 V

Question 6

Three 2 V cells in seriesW ith one in series-opposingW ould yield 2 V.

Question 7

Calculating current for a series resistor circuit can be accomplishedW ith a measured voltage across one of the resistors divided by that resistorʹs value.

Question 8

Voltage sources in series increase both voltage and current capacity.

Question 9

If a resistor is rated at 1/2W , it can safely dissipate 0.325W .

Question 10

If 4.7 , 2.2 and 1.2 resistors are wired in series, the total resistance is 8.7

Question 11

According to Kirchhoffʹs Voltage Law, the sum of the individual voltage drops in a series circuit equals the source Voltage.

Question 12

Calculate the current in Figure 4-1 if =16 V, R₁=10 , R₂=10 and R₃=15 .

A) 3.2 mA
B) 0 A
C) 12 mA
D) 1.6 mA

Question 13

VR₁=16 V, R₅=10 R₂=10 and R₃=15 in Figure 4-1 . If R₂ opens, then RT is

A) 10
B) 25
C) 0
D) infinite

Question 14

Calculate in Figure 4-1 if =16 V, R₁=10, R₂=10 and R₃=15 https://d2lvgg3v3hfg70.cloudfront.net/TB34225555/.

A) 0.0256 mW
B) 0.256 mW
C) 25.6 mW
D) 2.56 mW

Question 15

If a resistor is dissipating 1/4 W, it can supply 1/4 W to the load.

Question 16

The total power dissipated in a series circuit equals the sum of the individual powers.

Question 17

What is the total resistance in Figure 4-1 if R₁=10 , R₂=10 and R₃=15 ?

A) 25
B) 0
C) 35
D) infinite

Question 18

A series circuit has multiple current paths.

Question 19

Kirchhoffʹs Voltage Law states that the algebraic sum of all the voltages around a closed path is zero.

Question 20

If 6.8 , 1.2 and 5.6 resistors are wired in series, the total resistance is 13.6

Question 21

Calculate VT in Figure 4-1 if
and

A) 14.7 V
B) 4.7 V
C) 10 V
D) 30 V

Question 22

What is the total supply voltage if 16V and 12V sources are wired in series opposing?

A) 12 V
B) 4 V
C) 28 V
D) 16 V

Question 23

Calculate I_T in Figure 4-1 if R₁=4.7 , V_R1=10 V,R₂=4.7 and R₃=4.7

A) 1 mA
B) 6 mA
C) 4.26 mA
D) 2.13 mA

Question 24

When 50 V is applied to four series resistors, 100 flows. If R₁=12 , R₂=47 and R₃=56 k, what is the value of R₄ ?

A) 3.85
B) 3.85
C) 385
D) 38.5

Question 25

-1.2 V,+5 V and +6 V batteries are connected in series. The total voltage is

A) 9.8 V
B) 1.3 V
C) 12.2 V
D) 1.2 V

Question 26

A 22 and 12 resistor are connected across a 68 V source. How is the voltage divided?

A) 34 V and 34 V
B) 22 V and 12 V
C) 44 V and 24 V
D) 68 V and 68 V

Question 27

If a 100, 220 . and 330 resistor are connected in series, total resistance equals

A) 1650
B) the average of the three values
C) less than 100
D) 650

Question 28

If R2 opens in Figure 4-1, the total power dissipated ________.

A)increases to maximum
B)will depend upon the sourceVoltage
C)decreases to zero
D)remains the same

Question 29

If and and they are wired in series across a 20 V source, what is VR₁ and VR₂ ?

A)
B)
C)
D)

Question 30

If a 68, 33, 100 and 47 resistor are connected in series across a 9 V battery, the current equals

A) 36.3 mA
B) 327 mA
C) 22.3 mA
D) 27.6 A

Question 31

A 500 potentiometer is connected across a 5 V source. If the voltage from the wiper to the lower end of the potentiometer is 1.2 V , what is the resistance of that lower part?

A) 120
B) 380
C) 0
D) 500

Question 32

If 12 V and 17 V sources are Wired in series aiding,What is the total supply voltage?

A)29V
B)17V
C)5V
D)12V

Question 33

If 12 V and -19 V sources are connected so their total voltage is -7 V, they are ________.

A)series opposing
B)series aiding
C)connected dangerously
D)in parallel

Question 34

How much voltage is dropped across R₂ and R₃ in Figure 4-1 if and R₃=4.7 11ec8419_5174_ca64_9fdd_099b38855e81_TB34225555_11?

A)
B)
C)
D)

Question 35

Two 100 resistors are wired in series across a 20V source. How much voltage does each resistor drop?

A) 100
B) 100 mA
C) 20 V
D) 10 V

Question 36

If R₂ shorts in Figure 4-1, the total circuit power ________.

A)increases
B)remains the same
C)decreases
D)depends upon the sourceVoltage

Question 37

Based upon electron current flow, the polarity on the side of the resistor Where current enters is ________. The polarity on the side of the resistor Where current exits is ________.

A)positive, positive
B)positive, negative
C)negative, positive
D)negative, negative

Question 38

Four resistors are connected in series across an 18 V source. Three resistors drop 0 V and one resistor drops 18 V. Whatʹs the trouble?

A)The three resistors are open.
B)One resistor is open.
C)Two of the resistors are shorted.
D)There is no trouble; theseVoltages are normal.

Question 39

Calculate PT in Figure 4-1 if V_T = 100 V and all three resistors are each 47 kΩ

A)23.6 mW
B)70.9 mW
C)22W
D)709 mW

Question 40

R₁=4.7 , R₂=4.7 and R₃=4.7 in Figure 4-1 . What is RT if R₂ shorts?

A) 4.7 11ec8423_8606_ff62_9fdd_734a0d842e8d_TB34225555_11
B) 0
C) 9.4
D) infinite

Question 41

Four series resistors are connected across a 30 V source and carry 0.125mA . If R1=10, R2=33 and R3=47 , what is the value of R4 ?

A) 15
B) 150
C) 150
D) 1.5

Question 42

If five equal resistors dissipate a total of 10W in a series circuit, how much power does each resistor dissipate?

A)50W
B)10W
C)2W
D)5W

Question 43

If a 10 and 5 resistor are connected in series across a 12V source, the voltage across the 10 k resistor is and the voltage across the 5 resistor is

A) 4 V, 8 V
B) 4 V, 4 V
C) 8 V, 4 V
D) 8 V, 8 V

Question 44

If 18 V and 6 V sources are connected in series opposing,W hat is the total voltage?

A)18V
B)2V
C)6V
D)12V

Question 45

A short in a series circuit results in:

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

Question 46

In a series circuit, total power P_T is calculated as:

A)
B)
C)
D)

Question 47

One of the most popular applications of a potentiometer is as an adjustable voltage divider also known as a:

A)divider control.
B)volume control.
C)current control.
D)voltage control.

Question 48

If -12 V and -6 V are connected so they equal -18 V, these sources are ________.

A)connected dangerously
B)in parallel
C)series opposing
D)series aiding

Question 49

If 5 V and 16 V power supplies are connected in series aiding,W hat is the total voltage?

A)21V
B)24V
C)80V
D)16V

Question 50

A 50 potentiometer is connected across a 15 V source. If the voltage from the wiper to the lower end of the potentiometer is 3.2 V , what is the resistance of that lower part?

A) 39.3
B) 50
C) 10.7
D) 0

Question 51

If three 2.2 resistors are connected in series across a 50 V source, P_T equals

A) 52.08 mW
B) 402 mW
C) 104.2 mW
D) 379 mW

Question 52

Refer to Figure 4-2a. Voltage B to ground is less than normal.What could be the cause of failure?

A)short between A and B
B)open between B and C
C)open between C and D
D)short between E and D

Question 53

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

A)the largest resistor.
B)the smallest resistor.
C)the first resistor.
D)any resistor, since the current is the same throughout the circuit.

Question 54

The voltage drop across any resistor or combination of resistors in a series circuit equals:

A)the ratio of the resistanceV
Alues to the total resistance times the source Voltage.
B)the product of the circuit current times the resistanceV
Alue.
C)the appliedVoltage across the resistor (A).
D)all of these.

Question 55

Circuit ground or chassis ground can be thought of as a:

A)neutral connection point.
B)common point.
C)reference point.
D)all of these

Question 56

A)9V
B)12V
C)3V
D)6V

Question 57

Three resistors are connected in series across a 60 V source. If V_R1=19 V and V_R2=14.3 V , then what is the voltage drop across R₃ ?

A) 14.3 V
B) 45.7 V
C) 19 V
D) 26.7V

Question 58

An open in a series circuit results in:

A)no current flow.
B)sourceVoltage appearing across the open.
C)no power dissipation.
D)all of these.

Question 59

If a 4.7 , 5.6 and 10 resistor are in series, which resistor drops the most voltage?

A) the 10 resistor
B) the 5.6 resistor
C) the 4.7 resistor
D) That can't be determined from the given information.

Question 60

If each of the six resistors in a series circuit drops 5 V, the source voltage ________.

A)depends on the current
B)equals 30V
C)equals 5V
D)depends on the resistorV
Alues

Question 61

What is the easiest, most practical measurement performed during troubleshooting?

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

Question 62

Refer to Figure 4-2a. The resistor between points E and D looks charred.W hat most likely Would cause this?

A)short between A and D
B)open A and the power supply
C)short between A and B
D)Any of these could cause this problem.

Question 63

What type of resistor could be used as variable voltage-divider?

A)rheostat
B)potentiometer
C)thermistor
D)any one of the above

Question 64

Refer to Figure 4-2a. Voltage from C to ground is 100 V. What is the probable cause of failure?

A)open between E and D
B)short between A and B
C)open between A and B
D)voltage reading is normal