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The slope of the V-I curve is 7°. 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 7°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .122 Ω

(b) .360 Ω

(c) .377 Ω

(d) .578 Ω

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

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The correct choice is (a) .122 Ω

Best explanation: The slope of the V-I curve is resistance. The slope given is 7° so R=tan(7°)=.122 Ω. The slope of the I-V curve is reciprocal of resistance.

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