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Free Practice Quiz Question List

3 Current and Circuits Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 Current and Circuits, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

In a metal wire connected to a source, how does electron drift direction compare with the conventional current direction?

  1. A

    Conventional current and electron drift point in the same direction.

  2. B

    Conventional current and electron drift point in opposite directions.

  3. C

    Electrons drift from the positive terminal toward the negative terminal, as conventional current does.

02
True or false
1 point

In a steady-state direct-current circuit, current flows in one direction and has constant magnitude.

  1. A

    True

  2. B

    False

03
Fill in the blank
1 point

For a uniform wire, if its material and cross-sectional area stay fixed, increasing its length makes its resistance . If its material and length stay fixed, increasing its cross-sectional area makes its resistance .

04
Choose one
1 point

Two resistors of 3 Ω3\ \Omega and 5 Ω5\ \Omega are connected in series. What is their equivalent resistance?

  1. A

    8 Ω8\ \Omega

  2. B

    2 Ω2\ \Omega

  3. C

    158 Ω\frac{15}{8}\ \Omega

05
Choose all
1 point

Select all statements that are true for components connected in series.

  1. A

    The same current passes through each component.

  2. B

    The voltage across each component must be the same.

  3. C

    The equivalent resistance is the sum of the component resistances.

  4. D

    The equivalent resistance is found by adding the reciprocals of the component resistances.

06
True or false
1 point

The electromotive force of a battery is a mechanical force exerted on charges, measured in newtons.

  1. A

    True

  2. B

    False

07
Written response
1 point

A source has emf 15 V15\ \mathrm{V} and internal resistance 2 Ω2\ \Omega. When it supplies a current of 2 A2\ \mathrm{A}, what is its terminal voltage? Enter the value in volts.

08
Choose one
1 point

A 6 Ω6\ \Omega resistor is connected across a 12 V12\ \mathrm{V} voltage. How much electrical power does it dissipate?

  1. A

    2 W2\ \mathrm{W}

  2. B

    24 W24\ \mathrm{W}

  3. C

    72 W72\ \mathrm{W}

  4. D

    144 W144\ \mathrm{W}

09
Fill in the blank
1 point

By Kirchhoff’s junction rule, total current entering a junction equals total current it. By Kirchhoff’s loop rule, the algebraic sum of voltage changes around a closed loop is .

10
Written response
1 point

A uniform wire has resistance 4 Ω4\ \Omega. Its length and cross-sectional area are both doubled, while its material stays the same. What is its new resistance? Enter the value in ohms.

11
Choose all
1 point

Select all statements that are true for resistors connected in parallel.

  1. A

    The voltage across each branch is the same.

  2. B

    The current through every branch must be the same.

  3. C

    The branch currents add to give the total current.

  4. D

    The equivalent resistance is the sum of the branch resistances.

12
Written response
1 point

A charge of 24 C24\ \mathrm{C} passes a cross-section of a conductor in 8 s8\ \mathrm{s}. What is the current? Enter the value in amperes.

13
Choose one
1 point

An ohmic resistor has a voltage of 18 V18\ \mathrm{V} across it and carries a current of 3 A3\ \mathrm{A}. What is its resistance?

  1. A

    3 Ω3\ \Omega

  2. B

    5 Ω5\ \Omega

  3. C

    6 Ω6\ \Omega

  4. D

    54 Ω54\ \Omega

14
Open ended
1 point

An 18 V18\ \mathrm{V} source has internal resistance 1 Ω1\ \Omega and supplies two 6 Ω6\ \Omega resistors connected in parallel. Determine (a) the current delivered by the source, (b) the terminal voltage, and (c) the current in each load branch. Show how you apply the circuit relationships.

15
True or false
1 point

In a steady-state direct-current circuit, the current's magnitude is constant over time.

  1. A

    True

  2. B

    False

16
Choose one
1 point

In a metal wire connected to a source, how does conventional current compare with the direction of electron drift?

  1. A

    Conventional current and electron drift point in the same direction.

  2. B

    Conventional current points opposite to electron drift.

  3. C

    Conventional current is defined only in circuits with alternating current.

  4. D

    Electron drift points from the source's positive terminal toward its negative terminal.

17
Choose one
1 point

A uniform wire is replaced with one made of the same material and having the same cross-sectional area, but three times the length. How does its resistance change?

  1. A

    The resistance becomes one-third as large.

  2. B

    The resistance stays the same.

  3. C

    The resistance becomes three times as large.

  4. D

    The resistance becomes nine times as large.

18
Written response
1 point

A charge of 18 C18\ \mathrm{C} passes a cross-section of a conductor in 3 s3\ \mathrm{s}. What is the current? Enter the value in amperes.

19
Choose one
1 point

A 6 Ω6\ \Omega resistor is connected across a 12 V12\ \mathrm{V} voltage. How much electrical power does the resistor convert?

  1. A

    2 W2\ \mathrm{W}

  2. B

    24 W24\ \mathrm{W}

  3. C

    72 W72\ \mathrm{W}

  4. D

    144 W144\ \mathrm{W}

20
Choose one
1 point

A 6 Ω6\ \Omega resistor and a 3 Ω3\ \Omega resistor are connected in parallel. What is their equivalent resistance?

  1. A

    1 Ω1\ \Omega

  2. B

    1.5 Ω1.5\ \Omega

  3. C

    2 Ω2\ \Omega

  4. D

    9 Ω9\ \Omega