Equivalent Resistance Multiple Choice Questions [MCQ] – Series and Parallel Circuits

Multiple choice questions on Equivalent resistance in circuits.

Equivalent Resistance Circuit 1

Find the equivalent resistance at points ab:

  1. 2.5 ohms
  2. 5 ohms
  3. 7.5 ohms
  4. 10 ohms

Correct answer: 3. 7.5 ohms

Solution: Req = 5 ohm + (5 ohms || 5 ohms)

= 5 ohms + (1/{(1/5) + (1/5)})

= 5 + 2.5 = 7.5 ohms

Also see: Series and Parallel Resistors MCQ

Equivalent Resistance Circuit 2

The equivalent resistance Req in the circuit given below is:

  1. 10 ohms
  2. 20 ohms
  3. 30 ohms
  4. 40 ohms

Correct answer: 3. 30 ohms

Solution:

R2 || R3 = 1/(1/R2 + 1/R3 ) = 1/(1/10 + 1/10) = 5 ohms

Now

R1 + R2 || R3 + R4 = 5 + 5 + 20 = 30 ohms

Given below are a few tips for solving resistors in parallel:

One thought on “Equivalent Resistance Multiple Choice Questions [MCQ] – Series and Parallel Circuits

  • October 4, 2020 at 11:12 am
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