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Subelement A
Principles
Section 6
Electrical Measurements
An AC ammeter indicates:
• Effective (TRM) values of current.
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
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.
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?
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
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.
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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