Quiz 23
Multiple-choice questions on series and parallel networks
1.
If two 4 resistors are connected in series the effective resistance of the circuit is:
(a) 8 (b) 4 (c) 2 (d) 1 2.
If two 4 resistors are connected in parallel the effective resistance of the circuit is:
(a) 8 (b) 4 (c) 2 (d) 1 3.
With the switch in Figure 36.37 closed, the ammeter reading will indicate:
2
(a) 1 A
(b) 75 A
3
1
(c)
A
(d) 3 A
3
3Ω
5Ω
7Ω
A
5V
Figure 36.37
4.
The effect of connecting an additional parallel load to an electrical supply source is to increase the:
(a) resistance of the load
(b) voltage of the source
(c) current taken from the source
(d) p.d. across the load
5.
The equivalent resistance when a resistor of
1
1
is connected in parallel with a resistance is:
3
4
1
(b) 7 7
1
3
(c)
(d)
12
4
6. A 6 resistor is connected in parallel with the three resistors of Figure 36.38. With the switch closed the
ammeter reading will indicate:
3
(a)
A
(b) 4 A
4
1
1
(c)
A
(d) 1 A
4
3
(a)
Science for Engineering. 978-1-138-82688-5, © John Bird. Published by Taylor & Francis. All rights reserved.
2Ω
6Ω
10 Ω
A
6V
Figure 36.38
A 10 resistor is connected in parallel with a 15 resistor and the combination in series with a 12 resistor. The equivalent resistance of the circuit is:
(a)
(c)
3
1
(b)
(d)
9
0.333 The total resistance of two resistors R1 and R2 when connected in parallel is given by:
1
1
(a) R1 + R2
(b)
+
R1
R2
R1 + R 2
R 1 R2
(c)
(d)
R1 R2
R1 + R 2
If in the circuit shown in Figure 36.39, the reading on the voltmeter is 5 V and the reading on the ammeter
is 25 mA, the resistance of resistor R is:
(a)
(c)
0.005 125 (b)
(d)
3
200 R
A
V
Figure 36.39
4. (c)
9. (d)
5. (a)
10. (d)
10.
18 4
When three 3 resistors are connected in parallel, the total resistance is:
(a)
(c)
9.
(b)
(d)
3. (c)
8. (c)
8.
37 27 Answers
1. (a)
2. (c)
6. (d)
7. (b)
7.