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Home Electrical Engineering Ohm's Law Comments

  • Question
  • 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

  • Correct Answer
  • 112 Ω 


  • Ohm's Law problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?

    • Options
    • A. 8.25 V
    • B. 82.5 V
    • C. 14.6 V
    • D. 146 V
    • Discuss
    • 4. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

    • Options
    • A. 2 mA
    • B. 2.2 mA
    • C. 214 mA
    • D. 21.4 mA
    • Discuss
    • 5. The formula to find I when the values of V and R are known is

    • Options
    • A. I = VR
    • B. I = R/V
    • C. V = IR
    • D. I = V/R
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • Discuss
    • 9. 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
    • 10. 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


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