Ohm’s Law MCQ [Quiz Questions with Answers]

Ohm’s law is one of the fundamental principles of Electrical Engineering. It relates the flow of electric current to the applied voltage. The law is applicable to resistive circuits.

Statement: The electric current flowing through a constant resistor is directly proportional to the voltage applied across it

Mathematically: V ∝ I or V = IR

where

V = Voltage (In volts)

I = Current (In amps)

R = Resistance (In ohms)

More about Electrical Units and Quantities

Ohm’s Law Solved MCQ Example

Solution: I = V/R = 10 V / 5 Ω = 2 A

More Ohm’s Law MCQ

A 1 kΩ resistor has 20 mA of current flowing through it. Determine the value of the applied voltage:

  1. 0.05 V
  2. 1 V
  3. 15 V
  4. 20 V

Correct answer: 4. 20 V


An electric lamp draws 2 A current when connected to a 120 V source. What is the resistance of source:

  1. 2 Ω
  2. 60 Ω
  3. 120 Ω
  4. 240 Ω

Correct answer: 2. Ω

Explanation: R = V/I = 120 V/ 2A = 60 Ω


An electric heater having element resistance of 2 ohms will draw how much current when connected to a 230 V source:

  1. 2 A
  2. 75 A
  3. 115 A
  4. 230 A

Correct answer: 3. 115 A

Solution: I = V/R = 230 V / 2 ohms = 115 A


More MCQ with answers:

  1. Basic Electrical Laws

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