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

  • A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?


  • Options
  • A. 91 mA
  • B. 78 mA
  • C. 57 mA
  • D. 400 mA

  • Correct Answer
  • 78 mA 

    • More questions

    • 1. A short in a series circuit prevents current.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Three hundred joules of energy are consumed in 15 s. The power is

    • Options
    • A. 2,000 W
    • B. 2 W
    • C. 20 W
    • D. 200 W
      • Discuss
    • 3. An autotransformer is one in which the primary and secondary are automatically coupled.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The tesla is the unit of magnetic flux.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Watt's law states the relationships of power to energy.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The capacitor voltage always leads the current by 90°.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. If a 6 V and a 9 V source are connected series aiding, the total voltage is

    • Options
    • A. 6 V
    • B. 9 V
    • C. 3 V
    • D. 15 V
      • Discuss
    • 8. Total current in an RC circuit always leads the source voltage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In 40 kW, there are

    • Options
    • A. 0.4 mW
    • B. 40,000 W
    • C. 400 W
    • D. 5,000 W
      • Discuss
    • 10. Energy is stored by a capacitor in a magnetic field.

    • Options
    • A. True
    • B. False
      • Discuss

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