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  • Question
  • A 220 Ω resistor dissipates 3 W. The voltage is


  • Options
  • A. 73.3 V
  • B. 2.5 V
  • C. 25.7 V
  • D. 257 V

  • Correct Answer
  • 25.7 V 


  • Energy and Power problems


    Search Results


    • 1. If you used 400 W of power for 30 h, you have used

    • Options
    • A. 1.3 kWh
    • B. 13.3 kWh
    • C. 1.2 kWh
    • D. 12 kWh
    • Discuss
    • 2. If you used 600 W of power for 60 h, you have used

    • Options
    • A. 36 kWh
    • B. 3.6 kWh
    • C. 10 kWh
    • D. 1 kWh
    • Discuss
    • 3. The unit of electrical charge is the

    • Options
    • A. volt
    • B. ampere
    • C. joule
    • D. coulomb
    • Discuss
    • 4. An ohmmeter is an instrument for measuring

    • Options
    • A. current
    • B. voltage
    • C. resistance
    • D. wattage
    • Discuss
    • 5. When placed close together, two positively charged materials will

    • Options
    • A. attract
    • B. become neutral
    • C. become negative
    • D. repel
    • Discuss
    • 6. A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is

    • Options
    • A. 8.57%
    • B. 42.85%
    • C. 4.28%
    • D. 85.7%
    • Discuss
    • 7. A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately

    • Options
    • A. 120 V
    • B. 1.2 V
    • C. 12 V
    • D. 6 V
    • Discuss
    • 8. In 0.025 W, there are

    • Options
    • A. 25 kW
    • B. 0.00025 mW
    • C. 2,500 µW
    • D. 25 mW
    • Discuss
    • 9. How many watt-hours represent 65 W used for 18 h?

    • Options
    • A. 11.7 Wh
    • B. 1,170 Wh
    • C. 11,700 Wh
    • D. 117,000 Wh
    • Discuss
    • 10. A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?

    • Options
    • A. 938 Wh
    • B. 0.938 Wh
    • C. 56.25 Wh
    • D. 5.6 Wh
    • Discuss


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