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Home ‣ Electrical Engineering ‣ RL Circuits See What Others Are Saying!
  • Question

  • A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3∠0° mA. The source voltage, expressed in polar form, is


  • Options
  • A. 3.84∠20.6° V
  • B. 12.8∠20.6° V
  • C. 0.3∠20.6° V
  • D. 13.84∠69.4° V

  • Correct Answer
  • 3.84∠20.6° V 

    • More questions

    • 1. In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A reflective load is a load as it appears to the source in the primary of a transformer.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A transformer changes ac to dc.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Series aiding is a term sometimes used to describe voltage sources of the same polarity in series.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The number 4,500,000 can be expressed as

    • Options
    • A. 4,500 × 106
    • B. 4.5 × 106
    • C. 4.5 × 10-3
    • D. either 4,500 × 104 or 4.5 × 106
      • Discuss
    • 6. Two 1.5 V cells are connected series opposing across two 100 Ω resistors in series. Total current flow is

    • Options
    • A. 15 mA
    • B. 5 mA
    • C. 2 mA
    • D. 0 A
      • Discuss
    • 7. The branch current method uses

    • Options
    • A. Kirchhoff's voltage and current laws
    • B. Thevenin's theorem and Ohm's law
    • C. Kirchhoff's current law and Ohm's law
    • D. the superposition theorem and Thevenin's theorem
      • Discuss
    • 8. Some circuits require more than one voltage or current source.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. An ohmmeter is an instrument for measuring

    • Options
    • A. current
    • B. voltage
    • C. resistance
    • D. wattage
      • Discuss
    • 10. In a three-phase system, the voltages are separated by

    • Options
    • A. 45°
    • B. 90°
    • C. 120°
    • D. 180°
      • Discuss

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