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Calculate the value of power factor if the values of R and Z are 2 Ω and 10 Ω.

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Calculate the value of power factor if the values of R and Z are 2 Ω and 10 Ω.

(a) 0.8

(b) 0.5

(c) 0.2

(d) 0.4

This question was addressed to me in exam.

My question is taken from Regenerative Braking of DC Series Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives

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The correct option is (c) 0.2

To explain I would say: The power factor is defined as the ratio of active power to the apparent power. Cos(φ)=R÷Z=2÷10=.2. It has no unit.

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