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Calculate the equivalent resistance when two resistances are connected in parallel of values 8 Ω, 8 Ω.

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Calculate the equivalent resistance when two resistances are connected in parallel of values 8 Ω, 8 Ω.

(a) 3 Ω

(b) 2 Ω

(c) 4 Ω

(d) 7 Ω

This question was addressed to me in my homework.

I want to ask this question from Regenerative Braking of DC Shunt Motors topic in chapter Braking of DC Motors & Induction Motors of Electric Drives

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Right option is (c) 4 Ω

Explanation: When two resistances are connected in parallel their equivalent resistance is equal to the harmonic mean of the individual resistances. Req=R1.R2÷(R1+R2)=8×8÷(8+8)=4 Ω.

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