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The slope of the V-I curve is 5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

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The slope of the V-I curve is 5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .3254 Ω

(b) .3608 Ω

(c) .3543 Ω

(d) .3443 Ω

The question was asked during an interview.

The origin of the question is DC Motors topic in section Characteristics of DC & AC Motors of Electric Drives

1 Answer

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Right option is (d) .3443 Ω

Explanation: The slope of the V-I curve is resistance. The slope given is 5° so R=tan(5°)=.3443 ω. The slope of the I-V curve is reciprocal of resistance.

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