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Free Practice Quiz Question List

6 Introductory Electrical Systems Online Quiz Questions

Use this free practice quiz with 20 questions to review 6 Introductory Electrical Systems, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

To measure the potential difference across a lamp, connect a voltmeter in parallel with the lamp.

  1. A

    True

  2. B

    False

02
True or false
1 point

A technician can safely measure a component's resistance by connecting an ohmmeter while the circuit is energized.

  1. A

    True

  2. B

    False

03
Choose one
1 point

Three components are connected one after another in a single series path. Which statement describes the current through them?

  1. A

    The current is divided equally among the components.

  2. B

    The same current passes through each component.

  3. C

    The source voltage is identical across every component.

  4. D

    The resistance of each component becomes zero.

04
Choose one
1 point

When choosing a source for a circuit, which statement about a real battery or power supply is accurate?

  1. A

    A source always supplies whatever current a connected load demands.

  2. B

    A source only supplies current when the circuit contains a fuse.

  3. C

    A source has limits, including finite current capacity and internal resistance.

  4. D

    A source provides electrical energy only when its load is connected in parallel.

05
Choose one
1 point

A designer is selecting a lamp for a power supply and its wiring. Which criterion is necessary for a properly matched system?

  1. A

    The load's voltage rating does not matter if a switch is used.

  2. B

    The load's operating voltage and current must be compatible with the source and wiring.

  3. C

    The wiring needs to be compatible with the source but not with the load.

  4. D

    A load is compatible whenever its resistance is greater than the source's internal resistance.

06
Written response
1 point

A safety design connects conductive equipment parts to one another. What is this connection called?

07
Choose all
1 point

Select all expressions that can calculate electrical power for a resistive load.

  1. A

    P=VIP=VI

  2. B

    P=V+IP=V+I

  3. C

    P=I2RP=I^2R

  4. D

    P=V2RP=\frac{V^2}{R}

08
Choose all
1 point

Select all statements that correctly distinguish grounding and bonding in a system's safety design.

  1. A

    Grounding connects designated parts of a system to earth.

  2. B

    Grounding and bonding make overcurrent protection unnecessary.

  3. C

    Bonding connects conductive equipment parts.

  4. D

    Bonding is the same as connecting a designated part of the system to earth.

09
Fill in the blank
1 point

For an ohmic component, Ohm's law states that V=V=.

10
Fill in the blank
1 point

According to Kirchhoff's current law, the total current entering a junction equals the total current it.

11
Written response
1 point

A 18 V18\,\mathrm{V} source is connected across a 9 Ω9\,\Omega ohmic resistor. What current flows through the resistor? Enter the value in amperes.

12
Choose one
1 point

At a junction, two branch currents of 1.5 A1.5\,\mathrm{A} and 2.5 A2.5\,\mathrm{A} flow toward the junction. What current must flow away from it?

  1. A

    1.0 A1.0\,\mathrm{A}

  2. B

    2.5 A2.5\,\mathrm{A}

  3. C

    4.0 A4.0\,\mathrm{A}

  4. D

    6.0 A6.0\,\mathrm{A}

13
Open ended
1 point

A 12 V12\,\mathrm{V} source feeds two parallel resistors of 8 Ω8\,\Omega and 4 Ω4\,\Omega. Find the current in each branch and the total source current, and state the voltage across each branch. Show how the circuit laws support your results.

14
Choose one
1 point

A switch opens in a circuit containing three loads in one series path. What happens to current in that path?

  1. A

    Only the component nearest the open point stops operating.

  2. B

    Current through the entire series path stops.

  3. C

    The current increases through all remaining components.

  4. D

    The source voltage becomes zero.

15
True or false
1 point

True or false: Grounding and bonding make overcurrent protection unnecessary.

  1. A

    True

  2. B

    False

16
Choose one
1 point

In a battery-powered lamp circuit, which description correctly identifies the battery and the lamp?

  1. A

    The battery is the load, and the lamp is the source.

  2. B

    The battery is the conductor, and the lamp is the control.

  3. C

    The battery is the source, and the lamp is the load.

  4. D

    The battery is the protection, and the lamp is the conductor.

17
Choose one
1 point

To measure the current through a circuit path with an ammeter, how should the meter be connected?

  1. A

    In parallel with the path being tested

  2. B

    In series with the path being tested

  3. C

    Across the source only, regardless of the path

  4. D

    Between the circuit and earth

18
Written response
1 point

When measuring the potential difference across a component, what connection arrangement should you use for the voltmeter?

19
Choose one
1 point

Two resistors are connected one after the other in a single series path. Which statement about the current through them is correct?

  1. A

    The current is the same through both resistors.

  2. B

    The voltage across both resistors must be the same.

  3. C

    The current through the larger resistor must be greater.

  4. D

    The source current is zero because the resistors share the voltage.

20
Written response
1 point

An ohmic load with resistance 4 Ω4\,\Omega is connected across a 12 V12\,\text{V} source. What current flows through the load? Enter the value in amperes.