Chapter 23: Electric Current

67 Questions | Total Attempts: 168

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Electric Current Quizzes & Trivia

Questions and Answers
  • 1. 
    Electrons are made to flow in a wire when there is
    • A. 

      An imbalance of charges in the wire.

    • B. 

      More potential energy at one end of the wire than the other.

    • C. 

      A potential difference across its ends.

  • 2. 
    An ampere is a unit of electrical
    • A. 

      Pressure.

    • B. 

      Current.

    • C. 

      Resistance.

    • D. 

      All of these

    • E. 

      None of these

  • 3. 
    A wire that carries an electric current
    • A. 

      Is electrically charged.

    • B. 

      May be electrically charged.

    • C. 

      Is never electrically charged.

  • 4. 
    A coulomb of charge that passes through a 6-volt battery is given
    • A. 

      6 joules.

    • B. 

      6 amperes.

    • C. 

      6 ohms.

    • D. 

      6 watts.

    • E. 

      6 newtons.

  • 5. 
    Which statement is correct?
    • A. 

      Charge flows in a closed circuit.

    • B. 

      Voltage flows through an open or a closed circuit.

    • C. 

      Resistance flows through an open circuit.

    • D. 

      Current is the primary cause of voltage.

  • 6. 
    Electrons move in an electrical circuit
    • A. 

      By being bumped by other electrons.

    • B. 

      By colliding with molecules.

    • C. 

      By interacting with an established electric field.

    • D. 

      Because the wires are so thin.

    • E. 

      None of these

  • 7. 
    Stretch a copper wire so that it is thinner and the resistance between its ends
    • A. 

      Decreases.

    • B. 

      Remains unchanged.

    • C. 

      Increases.

  • 8. 
    Heat a copper wire and its electric resistance
    • A. 

      Decreases.

    • B. 

      Remains unchanged.

    • C. 

      Increases.

  • 9. 
    A wire carrying a current is normally charged
    • A. 

      Negatively.

    • B. 

      Positively.

    • C. 

      Not at all.

  • 10. 
    In an ac circuit, the electric field
    • A. 

      Increases via the inverse-square law.

    • B. 

      Changes magnitude and direction with time.

    • C. 

      Is the same everywhere.

    • D. 

      Is non-existent.

    • E. 

      None of these

  • 11. 
    The current through a 10-ohm resistor connected to a 120-V power supply is
    • A. 

      1 A.

    • B. 

      10 A.

    • C. 

      12 A.

    • D. 

      120 A.

    • E. 

      None of these

  • 12. 
    A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
    • A. 

      5 V

    • B. 

      10 V

    • C. 

      15 V

    • D. 

      20 V

    • E. 

      More than 20 V

  • 13. 
    When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the resistor's value?
    • A. 

      2 ohms

    • B. 

      5 ohms

    • C. 

      10 ohms

    • D. 

      20 ohms

    • E. 

      More than 20 ohms

  • 14. 
    The primary source of electrons in an ordinary electrical circuit is
    • A. 

      A dry cell, wet cell or battery.

    • B. 

      The back emf of motors.

    • C. 

      The power station generator.

    • D. 

      The electrical circuit itself.

    • E. 

      None of these

  • 15. 
    The source of electrons lighting an incandescent ac light bulb is
    • A. 

      The power company.

    • B. 

      Electrical outlet.

    • C. 

      Atoms in the light bulb filament.

    • D. 

      The wire leading to the lamp.

    • E. 

      The source voltage.

  • 16. 
    A woman experiences an electrical shock. The electrons making the shock come from the
    • A. 

      Woman's body.

    • B. 

      Ground.

    • C. 

      Power plant.

    • D. 

      Hairdryer.

    • E. 

      Electric field in the air.

  • 17. 
    In a common dc circuit, electrons move at speeds of
    • A. 

      A fraction of a centimeter per second.

    • B. 

      Many centimeters per second.

    • C. 

      The speed of a sound wave.

    • D. 

      The speed of light.

    • E. 

      None of these

  • 18. 
    When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
    • A. 

      The speed of sound waves in metal.

    • B. 

      The speed of light.

    • C. 

      1000 cm/s.

    • D. 

      Less than 1 cm/s.

    • E. 

      Dependent on how quickly each electron bumps into the next electron.

  • 19. 
    Alternating current is normally produced by a
    • A. 

      Battery.

    • B. 

      Generator.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 20. 
    The electric power of a lamp that carries 2 A at 120 V is
    • A. 

      1/6 watts.

    • B. 

      2 watts.

    • C. 

      60 watts.

    • D. 

      20 watts.

    • E. 

      240 watts.

  • 21. 
    When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
    • A. 

      More than the resistance of either lamp.

    • B. 

      Less than the resistance of either lamp.

    • C. 

      None of these

  • 22. 
    When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
    • A. 

      More than the resistance of either lamp.

    • B. 

      Less than the resistance of either lamp.

    • C. 

      None of these

  • 23. 
    On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in
    • A. 

      Parallel.

    • B. 

      Perpendicular.

    • C. 

      Series.

    • D. 

      Haste.

  • 24. 
    Modern automobile headlights are connected in
    • A. 

      Parallel.

    • B. 

      Perpendicular.

    • C. 

      Series.

    • D. 

      None of these

  • 25. 
    There are electrons in the filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from
    • A. 

      Different electrons; the ones that flow in the circuit to your lamp.

    • B. 

      The same electrons.

    • C. 

      The positive charges that flow in the filament.