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  • Question

  • In an RC circuit, true power (PR) equals:


  • Options
  • A. In an RC circuit, true power (PR) equals: VS × I I2R VT × RT
  • B. VS × I
  • C. I2R
  • D. VT × RT

  • Correct Answer
  • I2R 

    • Capacitors problems

    Search Results

    • 1. In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?

    • Options
    • A. bandpass
    • B. low-pass
    • C. high-pass
    • D. band-stop
      • Discuss
    • 2. If the dielectric constant of a capacitor is decreased, then its capacitance will:

    • Options
    • A. increase
    • B. decrease
    • C. remain the same
    • D. be destroyed
      • Discuss
    • 3. What is this circuit?


    • Options
    • A. bandpass filter
    • B. high-pass filter
    • C. low-pass filter
    • D. differentiator
      • Discuss
    • 4. The quantity that represents an ideal capacitor dissipating 0 W of power is

    • Options
    • A. instantaneous power
    • B. true power
    • C. reactive power
    • D. resistive power
      • Discuss
    • 5. When is a capacitor fully charged?

    • Options
    • A. when the voltage across its plates is of the voltage from ground to one of its plates
    • B. when the current through the capacitor is the same as when the capacitor is discharged
    • C. when the voltage across the plates is 0.707 of the input voltage
    • D. when the current through the capacitor is directly proportional to the area of the plates
      • Discuss
    • 6. If an open capacitor is checked with an ohmmeter, the needle will:

    • Options
    • A. stay on zero
    • B. stay on infinity
    • C. move from zero to infinity
    • D. move from infinity to zero
      • Discuss
    • 7. In a purely capacitive circuit,

    • Options
    • A. current leads voltage by 90°
    • B. voltage leads current by 90°
    • C. current lags voltage by 90°
    • D. current and voltage have a phase relationship of 0°
      • Discuss
    • 8. Power stored from the source and then returned to the source is called:

    • Options
    • A. apparent power
    • B. impedance power
    • C. reactive power
    • D. true power
      • Discuss
    • 9. What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?

    • Options
    • A. 37.8 V
    • B. 38 V
    • C. 63 V
    • D. 101 V
      • Discuss
    • 10. The material used between the plates of a capacitor is called its:

    • Options
    • A. insulation material
    • B. dielectric material
    • C. separation material
    • D. plate-divider material
      • Discuss

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