Two resistors of 5 ohm and 20 ohm are connected in parallel. What is the equivalent resistance?

Answer and explanation

Correct answer: A. 4 ohm

  1. Step 1: For parallel resistors, R = R1 R2 / (R1 + R2).
  2. Step 2: R = 5 x 20 / 25 = 4 ohm.
Answer
4 ohm.
Why not the others: '25 ohm' adds the resistances as if they were in series; '12.5 ohm' averages the two resistances; '100 ohm' multiplies without dividing by the sum.

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