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RL Circuits problems


  • 1. 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
  • Discuss
  • 2. Referring to Problem 18, the circuit impedance is

  • Options
  • A. 458 ∠?76° Ω
  • B. 4.58 ∠?76° Ω
  • C. 458∠76° Ω
  • D. 4.58∠76° Ω
  • Discuss
  • 3. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance

  • Options
  • A. decreases
  • B. increases
  • C. does not change
  • D. cannot be determined without values
  • Discuss
  • 4. A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is

  • Options
  • A. 47∠68.6° Ω
  • B. 120∠68.6° Ω
  • C. 129∠31.4° Ω
  • D. 129∠68.6° Ω
  • Discuss
  • 5. A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is

  • Options
  • A. 8.74 mA
  • B. 874 mA
  • C. 874 µA
  • D. 8.74 µA
  • Discuss
  • 6. A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

  • Options
  • A. 152.6 Ω
  • B. 1,526 Ω
  • C. 1,200 Ω
  • D. 942 Ω
  • Discuss
  • 7. When the frequency of the voltage applied to a series RL circuit is increased, the phase angle

  • Options
  • A. decreases
  • B. increases
  • C. does not change
  • D. cannot be determined without values
  • Discuss
  • 8. A 470 Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is

  • Options
  • A. 12.60 ∠?76° mS
  • B. 12.18∠76° mS
  • C. 218 ∠?76° mS
  • D. 12.18 ∠?76° mS
  • Discuss
  • 9. A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is

  • Options
  • A. 152 mA
  • B. 32 mA
  • C. 12 mA
  • D. 120 mA
  • Discuss
  • 10. In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is

  • Options
  • A. 18.4 V
  • B. 26.0 V
  • C. 2 V
  • D. 20 V
  • Discuss

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