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Grade: Upto college level

                        

Sir please tell what is the phase angle between current and voltage when it pass through pure capacitance 1)60 2)90 3)180 4)0 and also tell how to find it through capacitance

9 years ago

Answers : (1)

vikas askiitian expert
509 Points
							

E = Eosinwt      ..............................1

Eo is the peak voltage

E across capacitor = dq/c

dq/c = Eosinwt

differentiating this equation

(1/c)(dq/dt) = Eowcoswt

 I = Eowc coswt         ...................2

I = Eo/(1/wc) {coswt}

1/wc = Rc (capacitive reactance)

I = Eowc {sin(pi/2 +wt)}         .............3                  [cos@ = sin(pi/2+@) ]

comparing  eq 1 & 3 we see that current leads the voltage by an angle of pi/2

therefore phase difference bw current & voltage across capacitor is 90o .......

 

approve if u like my ans

9 years ago
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