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CBSE Class 12-science Answered

tan fi= (Xc-XL)/R or tan fi= (XL-Xc)/R
Asked by rbharti222 | 12 Feb, 2012, 10:25: AM
answered-by-expert Expert Answer
Phase angle ? by which alternating current lags behind the alternating voltage is:
tan? =(XL -XC)/R
when XL > XC, Tan? is positive . therefore, ? is positive. hence voltage leads the current by a phase angle ?.
when XL < XC ,Tan? is negative.therefore, ? is negative. hence voltage lags behind the current by a phase angle ?.
Answered by | 12 Feb, 2012, 11:43: PM

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