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Home Electrical Engineering Ohm's Law Comments

  • Question
  • What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?


  • Options
  • A. 8.2 kΩ
  • B. 820 Ω
  • C. 8.2 Ω
  • D. 82 Ω

  • Correct Answer
  • 82 Ω 


  • Ohm's Law problems


    Search Results


    • 1. 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
    • 2. When these numbers are multiplied, (6 × 103) (5 × 105), the result is

    • Options
    • A. 3 × 108
    • B. 30 × 108
    • C. 300 × 109
    • D. 3,000 × 107
    • Discuss
    • 3. When these numbers are added, (87 × 105) + (2.5 × 106), the result is

    • Options
    • A. 1.12 × 104
    • B. 11.2 × 105
    • C. 112 × 105
    • D. 1,120 × 106
    • Discuss
    • 4. The number of millivolts in 0.06 kilovolts is

    • Options
    • A. 600 V
    • B. 6,000 mV
    • C. 60,000 mV
    • D. 600,000 mV
    • Discuss
    • 5. Seven thousand volts can be expressed as

    • Options
    • A. 7 kV
    • B. 7 MV
    • C. 7 mV
    • D. either 7 kV or 7 mV
    • Discuss
    • 6. When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is

    • Options
    • A. 14.4 V
    • B. 1.4 V
    • C. 100 V
    • D. 10 V
    • Discuss
    • 7. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

    • Options
    • A. 40 Ω
    • B. 4 Ω
    • C. 2 Ω
    • D. 20 Ω
    • Discuss
    • 8. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?

    • Options
    • A. 1.8 V
    • B. 18 V
    • C. 7.2 V
    • D. 72 V
    • Discuss
    • 9. 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
    • 10. 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


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