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Home ‣ Electronics ‣ Alternating Current vs Direct Current See What Others Are Saying!
  • Question

  • If a voltmeter measures a sine wave as 500 mV, what would be its average value?


  • Options
  • A. 159.0 mV
  • B. 318.5 mV
  • C. 353.5 mV
  • D. 451.0 mV

  • Correct Answer
  • 451.0 mV 

    Explanation
    Some AC Voltage Conversion:


    Peak to rms: multiply peak by 0.707.

    Peak to average: multiply peak by 0.637.

    Rms to peak: multiply rms by 1.414.

    Rms to average: multiply rms by 0.9.

    Average to rms: multiply avg by 1.111.

    Average to peak: multiply avg by 1.567.


    Mostly voltmeter shows rms value. So, Vav = 0.9*Vrms

    = 0.9*500.

    = 450mV ~ [D] 451 mV.

    More questions

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    • Options
    • A. channel
    • B. source
    • C. substrate
    • D. cathode
      • Discuss
    • 2. Capacitive reactance is inversely proportional with frequency.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. What is the average value of a 12 V peak wave?

    • Options
    • A. 3.82 V
    • B. 4.24 V
    • C. 7.64 V
    • D. 9.42 V
      • Discuss
    • 4. The DIAC is a:

    • Options
    • A. transistor
    • B. unidirectional device
    • C. three-layer device
    • D. bidirectional device
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    • 5. Phase angle is the difference in phase between the applied voltage (VS) and the circuit current (IT).

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Which is considered to be the common reference for a parallel circuit?

    • Options
    • A. Voltage
    • B. Current
    • C. Power
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      • Discuss
    • 7. 0.00015 V can be expressed in powers of ten as 1.5 × 10?4 V.

    • Options
    • A. True
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      • Discuss
    • 8. A 10 µF capacitor will have more capacitive reactance than a 20 µF capacitor in a 60 Hz circuit.

    • Options
    • A. True
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    • 9. A JFET can be either a current-controlled device or a voltage-controlled device.

    • Options
    • A. True
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    • 10. The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating.

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    • A. True
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