Two resistors of 4 ohm and 12 ohm are connected in parallel. What is the equivalent resistance?
Answer and explanation
Correct answer: C. 3 ohm
- Step 1: For parallel resistors, R = R1 R2 / (R1 + R2).
- Step 2: R = 4 x 12 / 16 = 3 ohm.
Answer
3 ohm.
Why not the others: '16 ohm' adds the resistances as if they were in series; '8 ohm' averages the two resistances; '48 ohm' multiplies without dividing by the sum.
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