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Subelement A
Principles
Section 6
Electrical Measurements
An AC ammeter indicates:
  • Effective (TRM) values of current.
  • Correct Answer
    Effective (RMS) values of current.
  • Peak values of current.
  • Average values of current.
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By what factor must the voltage of an AC circuit, as indicated on the scale of an AC voltmeter, be multiplied to obtain the peak voltage value?
  • 0.707
  • 0.9
  • Correct Answer
    1.414
  • 3.14
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What is the RMS voltage at a common household electrical power outlet?
  • 331-V AC.
  • 82.7-V AC.
  • 165.5-V AC.
  • Correct Answer
    117-V AC.
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What is the easiest voltage amplitude to measure by viewing a pure sine wave signal on an oscilloscope?
  • Correct Answer
    Peak-to-peak.
  • RMS.
  • Average.
  • DC.
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By what factor must the voltage measured in an AC circuit, as indicated on the scale of an AC voltmeter, be multiplied to obtain the average voltage value?
  • 0.707
  • 1.414
  • Correct Answer
    0.9
  • 3.14
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What is the peak voltage at a common household electrical outlet?
  • 234 volts.
  • 117 volts.
  • 331 volts.
  • Correct Answer
    165.5 volts.

Household voltage is 117 volts RMS. To convert from RMS to peak voltage, multiply by 1.414.

117 volts X 1.414 = 165.5 volts

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