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Calculate the equivalent resistance between A and B. (a)60 ohm

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Calculate the equivalent resistance between A and B.

(a) 60 ohm

(b) 15 ohm

(c) 12 ohm

(d) 48 ohm

This question was posed to me during an online interview.

My doubt is from Series Circuits and Parallel Networks in division Simple DC Networks of Basic Electrical Engineering

1 Answer

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Right option is (c) 12 ohm

Easiest explanation: 5 ohm and 15 ohm are connected in series to give 20 ohm.10ohm and 20 ohm are connected in series to give 30 ohm. Now both equivalent resistances (20ohm and 30 ohm) are in parallel to give equivalent resistance 20*30/(20+30) = 12 ohm.

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