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The slope of the V-I curve is 19°. 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 19°. 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

I got this question in an online interview.

My query is from DC Motors topic in chapter Characteristics of DC & AC Motors of Electric Drives

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Correct choice is (d) .3443 Ω

To explain: The slope of the V-I curve is resistance. The slope given is 19° so R=tan(19°)=.3443 Ω. The slope of the V-I curve is resistance.

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