Question

The slope of the V-I curve is 27°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .384 Ω

(b) .509 Ω

(c) .354 Ω

(d) .343 Ω

I have been asked this question in an online quiz.

I'd like to ask this question from DC Motors in portion Characteristics of DC & AC Motors of Electric Drives

Answer 1

Right choice is (b) .509 Ω

To elaborate: The slope of the V-I curve is resistance. The slope given is 27° so R=tan(27°)=.509 ω. The slope of the I-V curve is reciprocal of resistance.