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Electrical Engineering

Ohms Law MCQs

Practice Ohms Law MCQs for competitive exams.

Ohms Law MCQs

Practice questions from this topic.

What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

  1. A. 9.7 Ω
  2. B. 97 Ω
  3. C. 23 Ω
  4. D. 230 Ω
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How much resistance is required to limit the current from a 12 V battery to 3.6 mA?

  1. A. 3.3 kΩ
  2. B. 33 kΩ
  3. C. 2.2 kΩ
  4. D. 22 kΩ
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The formula to find I when the values of V and R are known is

  1. A. I = VR
  2. B. I = (R)/(V)
  3. C. V = IR
  4. D. I = (V)/(R)
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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

  1. A. 112 Ω
  2. B. 11.2 Ω
  3. C. 1.2 Ω
  4. D. 18 Ω
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What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?

  1. A. 1.8 V
  2. B. 18 V
  3. C. 7.2 V
  4. D. 72 V
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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?

  1. A. 9 V
  2. B. 900 mV
  3. C. 0 V
  4. D. 18 V
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Ohm's law describes how current is related to voltage and resistance.

  1. A. True
  2. B. False
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If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

  1. A. 220 kΩ
  2. B. 22 kΩ
  3. C. 2.2 kΩ
  4. D. 220 Ω
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When 12 V are applied across a 68 Ω resistor, the current is

  1. A. 816 mA
  2. B. 17.6 mA
  3. C. 176 mA
  4. D. 8.16 mA
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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.

  1. A. 40 Ω
  2. B. 4 Ω
  3. C. 2 Ω
  4. D. 20 Ω
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When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is

  1. A. 14.4 V
  2. B. 1.4 V
  3. C. 100 V
  4. D. 10 V
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The formula for finding voltage when resistance and current are known is V = (I)/(R).

  1. A. True
  2. B. False
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