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  • Question
  • When the frequency of the source voltage decreases, the impedance of a parallel RC circuit


  • Options
  • A. increases
  • B. decreases
  • C. does not change
  • D. decreases to zero

  • Correct Answer
  • increases 


  • RC Circuits problems


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    • 1. A 2 kΩ resistor and a 0.002 µF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

    • Options
    • A. 84.5 mW
    • B. 845 mW
    • C. 13 mW
    • D. 130 mW
    • Discuss
    • 2. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

    • Options
    • A. R = XC
    • B. R > XC
    • C. R < XC
    • D. R = 5XC
    • Discuss
    • 3. Point +4 on the complex plane is

    • Options
    • A. 4 units above the origin on the j axis
    • B. 4 units below the origin on the j axis
    • C. 4 units right of the origin on the real axis
    • D. 4 units left of the origin on the real axis
    • Discuss
    • 4. A 12 kΩ resistor is in series with a 0.02 µF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3∠0° mA, what is the source voltage expressed in polar form?

    • Options
    • A. 45.6 V
    • B. 411.3 V
    • C. 0.411 V
    • D. 4.11 V
    • Discuss
    • 5. In the complex plane, the number 4 + j3 is located in the

    • Options
    • A. first quadrant
    • B. second quadrant
    • C. third quadrant
    • D. fourth quadrant
    • Discuss
    • 6. A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is

    • Options
    • A. 212 Ω
    • B. 2.12 mS + j3.14 mS
    • C. 3.14 mS + j2.12 mS
    • D. 318.3 Ω
    • Discuss
    • 7. In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is

    • Options
    • A. 3 V
    • B. 27 V
    • C. 19.2 V
    • D. 1.9 V
    • Discuss
    • 8. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

    • Options
    • A. 4.24
    • B. 3.46
    • C. 2.16
    • D. 21.63
    • Discuss
    • 9. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is

    • Options
    • A. Z = 150
    • B. Z = 150∠90°Ω
    • C. Z = 150 ∠?90°Ω
    • D. Z = 150∠180°Ω
    • Discuss
    • 10. A 2 kΩ resistor is in series with a 0.015 µF capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?

    • Options
    • A. 73.4 Ω and ? = ?19.5°
    • B. 707 Ω and ? = ?19.5°
    • C. 2121 Ω and ? = ?19.5°
    • D. 734 Ω and ? = ?38.9°
    • Discuss


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