1.

An A.C. of frequency f is flowing in a circuit containing only a choke coil of inductance L. If V_(0) and I_(0) represent the peak values of the voltage and the current respectively, then the average power given by the source to the choke is equal to

Answer»

`I_(0)V_(0)//2`
`I_(0)^(2)V_(0)^(2)//2`
Zero
`(V_(0).(2pi fL))/(2)`

Solution :Impendance, `Z=sqrt(R^(2)+X_(L)^(2))=sqrt(R^(2)+(2pi fL)^(2))`
`therefore Z=sqrt(R^(2)+4pi^(2)f^(2)L^(2))`
`because P = epsilon_(rms)I_(rms)COS phi=epsilon_(rms)I_(rms)(R )/(sqrt(R^(2)+X_(L)^(2)))`
For idea CHOKE coil, `cos phi = 0` and R = 0
`therefore P = 0`


Discussion

No Comment Found

Related InterviewSolutions