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Subel. T5
11 questions
Subelement T5

ELECTRICAL PRINCIPLES

Section T5A

Current and voltage: terminology and units, conductors and insulators, alternating and direct current

Electrical current is measured in which of the following units?

  • Volts
  • Watts
  • Ohms
  • Correct Answer
    Amperes
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Electrical power is measured in which of the following units?

  • Volts
  • Correct Answer
    Watts
  • Watt-hours
  • Amperes
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What is the term for the flow of electrons in an electric circuit?

  • Voltage
  • Amperes per second
  • Volts per second
  • Correct Answer
    Current
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What term describes the number of times per second that an alternating current makes a complete cycle?

  • Pulse rate
  • Wave number
  • Correct Answer
    Frequency
  • Wavelength
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What is the electrical term for the force that causes electron flow?

  • Correct Answer
    Voltage
  • Ampere-hours
  • Capacitance
  • Inductance
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What is the unit of frequency?

  • Correct Answer
    Hertz
  • Henry
  • Farad
  • Epicycles per second
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Why are metals generally good conductors of electricity?

  • They have relatively high density
  • Correct Answer
    They have many free electrons
  • They have many free protons
  • They have relatively high Young’s modulus values
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Which of the following is a good electrical insulator?

  • Sea water
  • Correct Answer
    Glass
  • Stainless steel
  • Graphite
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Which of the following describes alternating current?

  • Current that alternates between a positive direction and zero
  • Current that alternates between a negative direction and zero
  • Correct Answer
    Current that alternates between positive and negative directions
  • All these answers are correct
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Which term describes the rate at which electrical energy is used?

  • Resistance
  • Current
  • Correct Answer
    Power
  • Voltage
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What type of current flow is opposed by resistance?

  • Direct current
  • Alternating current
  • RF current
  • Correct Answer
    All these choices are correct
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