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  • Question
  • 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

  • Correct Answer
  • 7.3 V 


  • Transformers problems


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    • 1. In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

    • Options
    • A. 0 W
    • B. 14.1 W
    • C. 111.5 W
    • D. 1,020 W
    • Discuss
    • 2. The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 Ω. The voltage across the load is

    • Options
    • A. 0 V
    • B. 6 V
    • C. 18 V
    • D. 2 V
    • Discuss
    • 3. A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

    • Options
    • A. 1.7 V
    • B. 0.85 V
    • C. 1 V
    • D. 0 V
    • Discuss
    • 4. A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

    • Options
    • A. 0.2
    • B. 0.4
    • C. 5
    • D. 25
    • Discuss
    • 5. How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

    • Options
    • A. 9 V
    • B. 90 V
    • C. 900 V
    • D. 0.9 V
    • Discuss
    • 6. If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

    • Options
    • A. 25 W
    • B. 0 W
    • C. 250 W
    • D. 2.5 W
    • Discuss
    • 7. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

    • Options
    • A. 0 V
    • B. 6 V
    • C. 48 V
    • D. 0.75 V
    • Discuss
    • 8. A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is

    • Options
    • A. 1.3 Ω
    • B. 7.8 Ω
    • C. 78 Ω
    • D. 13 Ω
    • Discuss
    • 9. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

    • Options
    • A. 12 V
    • B. 120 V
    • C. 240 V
    • D. 2,400 V
    • Discuss
    • 10. What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

    • Options
    • A. 0.4
    • B. 4
    • C. 9.6
    • D. 0.96
    • Discuss


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