Which, among the following, is the correct expression for φ.(a) φ=tan^-1 (XL/R)(b) φ=tan^-1 (R/XL)(c) φ=tan^-1 (XL*R)(d) φ=cos^-1 (XL/R)I had been asked this question in an online interview.This interesting question is from Resistance and Inductance in Series topic in chapter Single Phase Series Circuits of Basic Electrical Engineering

Which, among the following, is the correct expression for φ.(a) φ=ta

1.	Which, among the following, is the correct expression for φ.(a) φ=tan^-1 (XL/R)(b) φ=tan^-1 (R/XL)(c) φ=tan^-1 (XL*R)(d) φ=cos^-1 (XL/R)I had been asked this question in an online interview.This interesting question is from Resistance and Inductance in Series topic in chapter Single Phase Series Circuits of Basic Electrical Engineering
Answer» The correct option is (a) φ=tan^-1 (XL/R) The best I can EXPLAIN: From the IMPEDANCE TRIANGLE, we GET tanφ= XL/R. Hence φ=tan^-1 (XL/R).

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