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  • Question
  • 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

  • Correct Answer
  • 4.11 V 


  • RC Circuits problems


    Search Results


    • 1. 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
    • 2. A positive angle of 30° is equivalent to a negative angle of

    • Options
    • A. ?30°
    • B. ?330°
    • C. ?60°
    • D. ?180°
    • Discuss
    • 3. In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

    • Options
    • A. 200 mA
    • B. 100 mA
    • C. 282 mA
    • D. 141 mA
    • Discuss
    • 4. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. doubles
    • Discuss
    • 5. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is

    • Options
    • A. 9.2 mA
    • B. 92 mA
    • C. 4.6 mA
    • D. 460 mA
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • Discuss
    • 10. 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


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