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Home ‣ Electrical Engineering ‣ Ohm's Law Comments
  • Question

  • How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?


  • Options
  • A. 50 V
  • B. 500 V
  • C. 80 V
  • D. 8 V

  • Correct Answer
  • 500 V 

    • Ohm's Law problems

    Search Results

    • 1. Approximately how much current flows through a 3.3 MΩ resistor across a 30 V source?

    • Options
    • A. 9 µA
    • B. 90 µA
    • C. 900 µA
    • D. 9000 µA
      • Discuss
    • 2. When 12 V are applied across a 68 Ω resistor, the current is

    • Options
    • A. 816 mA
    • B. 17.6 mA
    • C. 176 mA
    • D. 8.16 mA
      • Discuss
    • 3. The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately

    • Options
    • A. 112 Ω
    • B. 11.2 Ω
    • C. 1.2 Ω
    • D. 18 Ω
      • Discuss
    • 4. Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce?

    • Options
    • A. 960 V
    • B. 9.6 V
    • C. 96 V
    • D. 8 V
      • Discuss
    • 5. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

    • Options
    • A. 9.7 Ω
    • B. 97 Ω
    • C. 23 Ω
    • D. 230 Ω
      • Discuss
    • 6. Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?

    • Options
    • A. 27.2 mA
    • B. 59 mA
    • C. 5.9 mA
    • D. 590 mA
      • Discuss
    • 7. 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
      • Discuss
    • 8. How much resistance is needed to draw 17.6 mA from a 12 volt source?

    • Options
    • A. 212 Ω
    • B. 6.8 kΩ
    • C. 68 Ω
    • D. 680 Ω
      • Discuss
    • 9. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

    • Options
    • A. 4 Ω
    • B. 400 Ω
    • C. 4 kΩ
    • D. 4.4 Ω
      • Discuss
    • 10. 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

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