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Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 2: Resistor Combinations and Ohms Law for Closed Circuits — Picture questions (exam style)

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  • Questions count: 22
  • Passing grade: 60%
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1.
In the circuit shown, when switch K is closed, how do the meter readings change?
In the circuit shown, when switch K is closed, how do the meter readings change?
A: decreases, V₁: decreases, V₂: unchanged
A: increases, V₁: increases, V₂: decreases
A: unchanged, V₁: increases, V₂: increases
A: increases, V₁: decreases, V₂: decreases
2.
With 4 Ω across a source the voltmeter reads 8 V; with 5 Ω it reads 8.18 V (table). Which option is correct?
With 4 Ω across a source the voltmeter reads 8 V; with 5 Ω it reads 8.18 V (table). Which option is correct?
E = 9 V, r = 1 Ω, max external power = 5.06 W
E = 9 V, r = 0.5 Ω, max external power = 40.5 W
E = 9 V, r = 0.25 Ω, max external power = 81 W
E = 4.5 V, r = 1 Ω, max external power = 81 W
3.
Identical lamps are connected as shown ((A and B in series) ∥ C). Rank them by brightness, brightest first.
Identical lamps are connected as shown ((A and B in series) ∥ C). Rank them by brightness, brightest first.
C > A=B
A > C > B
A > B > C
B > C > A
4.
5 identical cells in series (each E = 1.5 V, r = 0.3 Ω) but one is reversed as shown; external R = 6 Ω. Find the current.
5 identical cells in series (each E = 1.5 V, r = 0.3 Ω) but one is reversed as shown; external R = 6 Ω. Find the current.
0.800 A
0.600 A
0.750 A
1.00 A
5.
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the e.m.f. of the source?
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the e.m.f. of the source?
3.00 V
5.22 V
6.00 V
1.50 V
6.
Identical lamps are connected as shown (A, B, C in parallel). Rank them by brightness, brightest first.
Identical lamps are connected as shown (A, B, C in parallel). Rank them by brightness, brightest first.
A > B > C
A=B=C
B > C > A
A > C > B
7.
6 identical cells (each E = 2 V, r = 0.2 Ω) in parallel, then across R = 6 Ω. Find the current in R.
6 identical cells (each E = 2 V, r = 0.2 Ω) in parallel, then across R = 6 Ω. Find the current in R.
1.67 A
0.323 A
0.333 A
0.331 A
8.
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the efficiency when R = 4 r?
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the efficiency when R = 4 r?
66.7 %
20.0 %
50.0 %
80.0 %
9.
3 identical cells (each E = 2 V, r = 0.6 Ω) in series with R = 6 Ω as shown. Find the current in R.
3 identical cells (each E = 2 V, r = 0.6 Ω) in series with R = 6 Ω as shown. Find the current in R.
0.769 A
0.323 A
0.909 A
1.00 A
10.
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the efficiency when R = 3 r?
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the efficiency when R = 3 r?
25.0 %
50.0 %
60.0 %
75.0 %
11.
Identical lamps are connected as shown (lamp A in series with (B ∥ C)). Rank them by brightness, brightest first.
Identical lamps are connected as shown (lamp A in series with (B ∥ C)). Rank them by brightness, brightest first.
A > C > B
A > B > C
B > C > A
A > B=C
12.
3 identical cells (each E = 1.5 V, r = 0.5 Ω) in parallel, then across R = 2 Ω. Find the current in R.
3 identical cells (each E = 1.5 V, r = 0.5 Ω) in parallel, then across R = 2 Ω. Find the current in R.
0.750 A
0.600 A
0.692 A
1.29 A
13.
4 identical cells (each E = 1.5 V, r = 0.6 Ω) in parallel, then across R = 5 Ω. Find the current in R.
4 identical cells (each E = 1.5 V, r = 0.6 Ω) in parallel, then across R = 5 Ω. Find the current in R.
0.811 A
0.300 A
0.291 A
0.268 A
14.
5 identical cells (each E = 1.2 V, r = 1.0 Ω) in parallel, then across R = 4 Ω. Find the current in R.
5 identical cells (each E = 1.2 V, r = 1.0 Ω) in parallel, then across R = 4 Ω. Find the current in R.
0.240 A
0.286 A
0.300 A
0.667 A
15.
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the e.m.f. of the source?
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the e.m.f. of the source?
16.0 V
8.00 V
27.8 V
32.0 V
16.
4 identical cells in series (each E = 2 V, r = 1.0 Ω) but one is reversed as shown; external R = 3 Ω. Find the current.
4 identical cells in series (each E = 2 V, r = 1.0 Ω) but one is reversed as shown; external R = 3 Ω. Find the current.
0.857 A
1.14 A
1.33 A
0.571 A
17.
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the e.m.f. of the source?
The graph shows the power dissipated in a variable external resistor R connected to a source. What is the e.m.f. of the source?
3.00 V
6.00 V
12.0 V
10.4 V
18.
6 identical cells (each E = 2 V, r = 0.3 Ω) in series with R = 5 Ω as shown. Find the current in R.
6 identical cells (each E = 2 V, r = 0.3 Ω) in series with R = 5 Ω as shown. Find the current in R.
2.26 A
1.76 A
0.396 A
2.40 A
19.
Identical lamps are connected as shown (A, then (B ∥ C), then D in series). Rank them by brightness, brightest first.
Identical lamps are connected as shown (A, then (B ∥ C), then D in series). Rank them by brightness, brightest first.
D > A > B > C
A > C > B > D
A=D > B=C
C > B > D > A
20.
2 identical cells (each E = 1.2 V, r = 0.3 Ω) in parallel, then across R = 8 Ω. Find the current in R.
2 identical cells (each E = 1.2 V, r = 0.3 Ω) in parallel, then across R = 8 Ω. Find the current in R.
0.145 A
0.147 A
0.150 A
0.279 A
21.
6 identical cells in series (each E = 1.2 V, r = 0.5 Ω) but one is reversed as shown; external R = 4 Ω. Find the current.
6 identical cells in series (each E = 1.2 V, r = 0.5 Ω) but one is reversed as shown; external R = 4 Ω. Find the current.
1.03 A
0.857 A
0.686 A
1.20 A
22.
4 identical cells (each E = 1.2 V, r = 0.2 Ω) in series with R = 3 Ω as shown. Find the current in R.
4 identical cells (each E = 1.2 V, r = 0.2 Ω) in series with R = 3 Ω as shown. Find the current in R.
1.50 A
1.60 A
0.393 A
1.26 A
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