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The slope of the I-V curve is 180°. Calculate the value of resistance.

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The slope of the I-V curve is 180°. Calculate the value of resistance.

(a) inf Ω

(b) .81 Ω

(c) 45 Ω

(d) 41.2 Ω

This question was posed to me at a job interview.

The question is from Induction Motors in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

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Right option is (a) inf Ω

The explanation: The slope of the I-V curve is the reciprocal of the resistance. The slope given is 180° so R=1÷tan(180°)=inf Ω. The slope of the V-I curve is resistance. It behaves as an open circuit.

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