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Home ‣ Electrical Engineering ‣ Ohm's Law See What Others Are Saying!
  • Question

  • How much resistance is required to limit the current from a 12 V battery to 3.6 mA?


  • Options
  • A. 3.3 kΩ
  • B. 33 kΩ
  • C. 2.2 kΩ
  • D. 22 kΩ

  • Correct Answer
  • 3.3 kΩ 

    • More questions

    • 1. You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?

    • Options
    • A. 9 V
    • B. 900 mV
    • C. 0 V
    • D. 18 V
      • Discuss
    • 2. A certain amplifier has 600 Ω internal resistance looking from its output. In order to provide maximum power to a 4 Ω speaker, what turns ratio must be used in the coupling transformer?

    • Options
    • A. 8
    • B. 0.8
    • C. 0.08
    • D. 80
      • Discuss
    • 3. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. doubles
      • Discuss
    • 5. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is

    • Options
    • A. 0 V
    • B. 15 V
    • C. 10.60 V
    • D. 21.21 V
      • Discuss
    • 6. Find I2.

      4I1 + 4I2 = 2
      6I1 + 7I2 = 4


    • Options
    • A. 1 A
    • B. ?1 A
    • C. 100 mA
    • D. ?100 mA
      • Discuss
    • 7. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

    • Options
    • A. 0°
    • B. 45°
    • C. 40°
    • D. none of the above
      • Discuss
    • 8. The number 65,000 expressed in scientific notation as a number between 1 and 10 times a power of ten is

    • Options
    • A. 0.65 × 104
    • B. 6.5 × 104
    • C. 65 × 104
    • D. 650 × 103
      • Discuss
    • 9. In applying the superposition theorem,

    • Options
    • A. the sources are considered one at a time with all others replaced by their internal impedance
    • B. all sources are considered independently
    • C. all sources are considered simultaneously
    • D. the sources are considered one at a time with all others replaced by their internal resistance
      • Discuss
    • 10. The roll-off rate of a basic RC or RL filter is 20 dB per decade.

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

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