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Course: American System Physics
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American System Physics

A Physics Toolkit

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Representing Motion

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Accelerated Motion

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Forces in One Dimension

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Displacement and Force in Two Dimensions

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Motion in Two Dimensions

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Gravitation

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Rotational Motion

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Momentum and Its Conservation

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Energy and Its Conservation

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Thermal Energy

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States of Matter

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Vibrations and Waves

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Sound

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Fundamentals of Light

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Reflection and Refraction

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Interference and Diffraction

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Electrostatics

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Electric Current and Circuits

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Magnetic Fields

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Electromagnetic Induction and Electromagnetism

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Quantum Theory and the Atom

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Solid-State Electronics

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Nuclear and Particle Physics

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Quiz

19.0 Electric Current and Circuits: Current, Energy, Series and Parallel Circuits – Check yourself

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Electric Current and Circuits American Physics check yourself quiz: free practice for American System Physics. Work through this Electric Current and Circuits American Physics check yourself quiz and get instant feedback on every answer. If you get stuck, review the 19.3 Series and Parallel Circuits — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 21
  • Passing grade: B+
  • Time limit: 10 minutes
Start Quiz
1.
Two 10 Ω resistors in parallel
20 Ω
5 Ω
10 Ω
0
2.
In a series circuit, current
splits
is the same everywhere
is zero
doubles
3.
Which statement best describes Series circuit?
V = IR for ohmic conductors.
R = V/I (ohms).
One path; same current through each component.
Opens a circuit when current is too high.
4.
A 12 Ω and a 4.0 Ω resistor are connected in parallel across 12 V. What is the total current?
0.75 A
1.0 A
3.0 A
4.0 A
5.
At a junction, 5.0 A enters along one wire and 2.0 A leaves along a second wire. The only other wire is a third one. What current does it carry, and in which direction?
3.0 A entering the junction
3.0 A leaving the junction
7.0 A leaving the junction
2.5 A leaving the junction
6.
A student adds a third 60 Ω resistor in parallel with two 60 Ω resistors on a 12 V supply. By how much does the supply current increase?
0.60 A
0.067 A
0.20 A
It decreases by 0.20 A
7.
Using the table of appliances on a 120 V circuit protected by a 15 A breaker, which pair could run together without tripping the breaker?
Heater and lamp
Heater and kettle
Kettle and toaster
Heater and toaster
8.
A student tests identical lamps in series and in parallel on the same battery. Which row of the table is wrong?
Row 1
Row 2
Row 3
Row 4
9.
What is the reading on the ammeter in the circuit shown?
Dr Dabour Hub Academy - figure 1
1.0 A
0.92 A
6.0 A
2.0 A
10.
For the circuit shown, what is the current in the 6 Ω resistor?
Dr Dabour Hub Academy - figure 2
0.67 A
2.0 A
1.3 A
0.33 A
11.
A student builds the series circuit drawn, with a voltmeter across the 4 Ω resistor. Which pair of meter readings should she expect?
Dr Dabour Hub Academy - figure 3
Ammeter 1.0 A; voltmeter 6.0 V
Ammeter 1.0 A; voltmeter 4.0 V
Ammeter 3.0 A; voltmeter 4.0 V
Ammeter 1.5 A; voltmeter 2.0 V
12.
Why does a short circuit trip a circuit breaker?
It causes a very high resistance
It stops the current completely
The very low resistance path causes a very large current
It reverses the current
13.
Which is the correct order of steps for solving a combination circuit?
Find branch currents, then total R, then combine parallel groups
Find total I first, then total R, then parallel groups
Add all resistances, then divide the voltage equally
Find parallel groups, combine them, find total R, find total I, work back to branch values
14.
The table shows voltmeter readings around a single loop containing a 9.0 V battery and three resistors. The readings obey Kirchhoff’s voltage rule. True or false?
False, the readings add up to more than 9.0 V
False, each resistor should read 9.0 V
True only if the resistors are equal
True
15.
In the circuit shown, a wire (red) is connected across lamp L2. Lamps L1 and L3 become brighter and L2 goes out. True or false?
Dr Dabour Hub Academy - figure 4
True
False, all three lamps go out
False, all three become brighter
False, nothing changes
16.
In a parallel circuit the voltage across each branch is the same. True or false?
False, it is shared
False, it is zero
True only for identical resistors
True
17.
Adding resistors in parallel decreases the total resistance. True or false?
True
False, it increases
False, it stays the same
True only for series
18.
A fuse opens a circuit when the voltage is too high. True or false?
True
False
True only for 13 A fuses
False, it opens when the resistance is too high
19.
Kirchhoff’s voltage rule says the sum of voltage changes around any closed loop is zero. True or false?
True
False, the sum equals the current
False, it applies only at junctions
True only for parallel circuits
20.
If one lamp in a series circuit fails, the others stay on. True or false?
True
False
True only if they are identical
False, the others get brighter
21.
Two 8 Ω resistors in series have four times the resistance of the same two in parallel. True or false?
False, twice
True
False, the same
False, half
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Part of Electric Current and Circuits — see every lesson and quiz in this unit.
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