Physicshard · Past Paper
Calculate the effective resistance of three resistors 3Ω, 6Ω, and 9Ω connected in parallel.
A1.63 Ohms
B18 Ohms
C2 Ohms
D0.5 Ohms
✓ Correct Answer: A — 1.63 Ohms
1/R = 1/3 + 1/6 + 1/9 = (6+3+2)/18 = 11/18. R = 18/11 ≈ 1.636 Ohms.
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