Series Circuit
1.
When a fourth resistor is connected in series with three resistors, the total
resistance
A.
increases by one-fourth
B.
increases
C.
decreases
D.
remains the same
Answer & Explanation
Answer: Option B
2.
A string of five series resistors is connected across a 6 V battery. Zero voltage is
measured across all resistors except R3. The voltage across R3 is
A.
0V
B.
1.2 V
C.
6V
D.
0.6 V
Answer & Explanation
Answer: Option C
3.
A series circuit consists of three resistors with values of 120
. The total resistance is
A.
less than 120
B.
the average of the values
C.
720
D.
120
, 270
, and 330
Answer & Explanation
Answer: Option C
4.
A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W
resistor. The total resistance is 1200
. If each resistor is operating in the circuit at
its maximum power dissipation, total current flow is
A.
27 mA
B.
2.7 mA
C.
19 mA
D.
190 mA
Answer & Explanation
Answer: Option A
Explanation:
Total P = P1 + P2 + P3 = 7/8w.
P = I2R.
I = sqrt (P/R)
Now, P = 7/8w, R = 1200 ohm.
Therefore,
I= sqrt ( (7/8)/1200 ) = 0.0270030862 = 27 mA.
5.
Which of the following series combinations dissipates the most power when
connected across a 120 V source?
A.
one 220
resistor
B.
two 220
resistors
C.
three 220
D.
four 220
resistors
resistors
Answer & Explanation
6.
Answer: Option A
When one of three series resistors is removed from a circuit and the circuit is
reconnected, the current
A.
increases
B.
increases by one-third
C.
decreases by one-third
D.
decreases by the amount of current through the removed resistor
Answer & Explanation
Answer: Option A
7.
The total power in a certain circuit is 12 W. Each of the four equal-value series
resistors making up the circuit dissipates
A.
12 W
B.
48 W
C.
3W
D.
8W
Answer & Explanation
Answer: Option C
8.
The following resistors (one each) are connected in a series circuit: 470
1 k , and 1.2 k . The voltage source is 20 V. Current through the 680
is approximately
A.
60 mA
B.
30 mA
C.
6 mA
D.
300 mA
, 680 ,
resistor
Answer & Explanation
Answer: Option C
9.
A series circuit consists of a 4.7 k
that has the most voltage drop is
, a 12 k
, and a 2.2 k
A.
the 12 k
B.
the 2.2 k
C.
the 4.7 k
D.
impossible to determine from the given information
resistor. The resistor
Answer & Explanation
Answer: Option A
10. All the voltage drops and the source voltage added together in a series circuit is
equal to
A.
the total of the voltage drops
B.
the source voltage
C.
zero
D.
the total of the source voltage and the voltage drops
Answer & Explanation
Answer: Option C
11. Two resistors are in series: a 5.6 k resistor and a 4.7 k resistor. The voltage
drop across the 5.6 k resistor is 10 V. The voltage across the 4.7 k
resistor is
A.
8.39 V
B.
10 V
C.
2.32 V
D.
0V
Answer & Explanation
Answer: Option A
12. Three 680
circuit is
resistors are connected in series with a 470 V source. Current in the
A.
69 mA
B.
230 mA
C.
23 mA
D.
690 mA
Answer & Explanation
Answer: Option B
13. There are five resistors in a given series circuit and each resistor has 6 V dropped
across it. The source voltage
A.
is 6 V
B.
depends on the current flow
C.
depends on the resistor values
D.
is 30 V
Answer & Explanation
Answer: Option D
14. If a 6 V and a 9 V source are connected series aiding, the total voltage is
A.
6V
B.
9V
C.
3V
D.
15 V
Answer & Explanation
Answer: Option D
15. Five resistors are connected in a series and there is a current of 3 A into the first
resistor. The amount of current into the second resistor is
A.
3A
B.
1A
C.
4A
D.
0.3 A
Answer & Explanation
Answer: Option A
16. The total resistance of eight 5.6 k
A.
8
B.
5,600
C.
4,480
D.
44,800
resistors in series is
Answer & Explanation
Answer: Option D
17. A series circuit has a 24 V source and a total resistance of 120
through each resistor is
A.
24 mA
B.
200 mA
C.
120 mA
D.
20 mA
. The current
Answer & Explanation
Answer: Option B
18. To measure the current out of the second resistor in a circuit consisting of four
resistors, an ammeter can be placed
A.
between the second and third resistors
B.
at the negative terminal of the source
C.
between the third and fourth resistors
D.
at any point in the circuit
Answer & Explanation
Answer: Option D
19. A 12 V battery is connected across a series combination of 68
and 33 . The amount of current is
A.
326 mA
, 47
, 220
,
B.
16.3 mA
C.
32.6 mA
D.
163 mA
Answer & Explanation
Answer: Option C
20. If a 24 V and a 6 V battery are series opposing, the total voltage is
A.
30 V
B.
24 V
C.
18 V
D.
0V
Answer & Explanation
Answer: Option C
21. A series circuit consists of three resistors. Two resistors are 1.2 k
resistance is 12 k . The value of the third resistor
A.
is 9,600
B.
is 960
C.
is 1.2 k
D.
cannot be determined
each. The total
Answer & Explanation
Answer: Option A
22. Four equal-value resistors are in series with a 12 V battery and 13.63 mA are
measured. The value of each resistor is
A.
22
B.
220
C.
880
D.
88
Answer & Explanation
Answer: Option B
Explanation:
Total Resistance, r = 12 / 13.63
= 0.880 in ohms
Total Resistance, r= 880
Each resistance value = r/4
= 880/4
Each resistance value = 220 ohms.
23. Two 1.5 V cells are connected series opposing across two 100
Total current flow is
A.
15 mA
B.
5 mA
C.
2 mA
D.
0A
resistors in series.
Answer & Explanation
Answer: Option D
24. The total resistance of a circuit is 680 . The percentage of the total voltage
appearing across a 47
resistor that makes up part of the total series resistance is
A.
68%
B.
47%
C.
69%
D.
6.91%
Answer & Explanation
Answer: Option D
25. Two 6 V batteries are connected series aiding across two 1.2 k
Current through each resistor is
A.
5 mA
B.
10 mA
C.
0A
D.
2.5 mA
resistors in series.
Answer & Explanation
Answer: Option A
True Or False
1.
The term series opposing means that sources are in series with opposite polarities.
A.
True
Answer & Explanation
B.
False
Answer: Option A
2.
If you know the current anywhere in a series circuit, you know the current
everywhere in a series circuit.
A.
True
B.
False
Answer & Explanation
Answer: Option A
3.
In a series circuit, the individual powers are additive.
A.
True
B.
False
Answer & Explanation
Answer: Option A
4.
The total resistance of a series circuit is equal to the difference between the largest
and smallest value resistors.
A.
True
B.
False
Answer & Explanation
Answer: Option B
5.
The voltage at one point in a circuit is always measured relative to another point.
A.
True
B.
False
B.
False
Answer & Explanation
6.
Answer: Option A
A series circuit acts as a voltage divider.
A.
True
Answer & Explanation
Answer: Option A
7.
The sum of all the voltage drops around a single closed loop in a circuit is zero.
A.
True
B.
False
B.
False
B.
False
Answer & Explanation
Answer: Option A
8.
A short in a series circuit prevents current.
A.
True
Answer & Explanation
Answer: Option B
9.
A series circuit acts as a current divider.
A.
True
Answer & Explanation
Answer: Option B
10. Series aiding is a term sometimes used to describe voltage sources of the same
polarity in series.
A.
True
Answer & Explanation
Answer: Option A
B.
False