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Power factor of a Schering bridge is _________

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Power factor of a Schering bridge is _________

(a) p.f. = sin∅x = ^Zx⁄Rx

(b) p.f. = cot∅x = ^Rx⁄Zx

(c) p.f. = cos∅x = ^Rx⁄Zx

(d) p.f. = tan∅x = ^Rx⁄Zx

I have been asked this question during an online exam.

The question is from Schering Bridge topic in division Measurement of Inductance and Capacitance of Electrical Measurements

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Right option is (c) p.f. = cos∅x = ^Rx⁄Zx

Easy explanation: The power factor of the RC combination in a Schering bridge is given by the relation  p.f. = cos∅x = ^Rx⁄Zx .

where,

Rx is the series resistance

Zx is the series impedance comprising of Rx and Cx.

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