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Physics

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: 7
  • 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.
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
4.
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 %
5.
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 %
6.
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
7.
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
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