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CBSE Class 12-science Answered

tan Phi = XL-XC/R, what is Tan Phi called here

Asked by sky11841 | 08 Sep, 2021, 10:04: PM
Expert Answer
begin mathsize 14px style tan ϕ space equals space fraction numerator X subscript C minus X subscript L over denominator R end fraction end style
where begin mathsize 14px style ϕ end style is angle between Voltage and current .
XC = 1/Cω is capacitve reactance and XL = Lω is inductive reactance.
C is capacitance in the circuit , L is inductance in the circuit and ω is angular frequency of alternating voltage.
 
If voltage v = vm sin(ωt) , then current i = im sin(ωt + Φ )
 
If XC > XL , then begin mathsize 14px style ϕ end style > 0 , i.e., current leads voltage by angle begin mathsize 14px style ϕ end style.
 
If XC , XL , then begin mathsize 14px style ϕ end style < 0 , i.e., current lags behind voltage by angle begin mathsize 14px style ϕ end style.



 
Answered by Thiyagarajan K | 08 Sep, 2021, 11:14: PM
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