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Phase angle RC circuit

  • Thread starter pat666
  • Start date
  • #1
709
0

Homework Statement


Pls see the attachment.


Homework Equations





The Attempt at a Solution


Obviously I have B and C correct but for a the only thing I can find is tan(phi)=XL-Xc/R
This seems to be for a series RLC circuit though and I only have RC.
also I know that the current lags the p.d by 900 in an RC circuit but I cant see how I can use this????
any help appreciated.
 

Attachments

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
7
Phase angle can found by using

cosφ = R/sqrt(R^2 + XC^2)
 
Last edited:
  • #3
709
0
I dont know capacitive inductance though?????
 
  • #4
rl.bhat
Homework Helper
4,433
7
I dont know capacitive inductance though?????
Sorry. It should be XC. = 1/ωC
 
  • #5
709
0
Thanks that worked, although the answer was negative 89 degrees???
 
  • #6
ehild
Homework Helper
15,492
1,874
You can use the equation tan(phi)=(XL-Xc)/R for a series RCL circuit, even for XL=0 as it is the case now.

ehild
 

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