Two resistors of 9 ohm and 18 ohm are connected in parallel. What is the equivalent resistance?
Answer and explanation
Correct answer: C. 6 ohm
- Step 1: For parallel resistors, R = R1 R2 / (R1 + R2).
- Step 2: R = 9 x 18 / 27 = 6 ohm.
Answer
6 ohm.
Why not the others: '27 ohm' adds the resistances as if they were in series; '13.5 ohm' averages the two resistances; '162 ohm' multiplies without dividing by the sum.
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