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  • Question
  • Referring to the given circuit, find ZTH for the part of the circuit that is external to RL.

    Referring to the given circuit, find ZTH for the part of the circuit that is external to RL. 129?21.


  • Options
  • A. 129∠21.4° Ω
  • B. 43.7∠68.6° Ω
  • C. 43.7∠21.4° Ω
  • D. 12.9∠68.6° Ω

  • Correct Answer
  • 43.7∠68.6° Ω 


  • More questions

    • 1. Three 15 mH inductors are in series. The total inductance is

    • Options
    • A. 15 mH
    • B. 30 mH
    • C. 45 mH
    • D. 5 mH
    • Discuss
    • 2. A parallel circuit acts as a current divider.

    • Options
    • A. True
    • B. False
    • Discuss
    • 3. A capacitor blocks ac but passes dc.

    • Options
    • A. True
    • B. False
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    • 4. Current is measured in

    • Options
    • A. watts
    • B. volts
    • C. henries
    • D. amperes
    • Discuss
    • 5. The number of kilowatts in 135 milliwatts is

    • Options
    • A. 1.35 × 10?4 kW
    • B. 135 × 10?3 kW
    • C. 0.0135 kW
    • D. 0.00135 kW
    • Discuss
    • 6. When the current through a 12 kΩ resistor is 8 mA, the power is

    • Options
    • A. 7.68 mW
    • B. 768 mW
    • C. 7.68 W
    • D. 76.8 W
    • Discuss
    • 7. In an RL circuit, part of the power is resistive and part is reactive.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. The inductance of an iron-core coil decreases if

    • Options
    • A. the number of turns is decreased
    • B. the iron core is removed
    • C. the length of the coil decreases
    • D. none of the above
    • Discuss
    • 9. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 Ω. What is the approximate voltage across the load?

    • Options
    • A. 7.3 V
    • B. 73 V
    • C. 88 V
    • D. 880 V
    • Discuss
    • 10. A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is

    • Options
    • A. 48 µs
    • B. 480 µs
    • C. 2.42 µs
    • D. 24 µs
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