AC circuit with capacitor and resistor current mismatch

  • Thread starter Thread starter k31453
  • Start date Start date
  • Tags Tags
    Impedance
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
Sign up Log in
3 replies · 2K views
k31453
Messages
58
Reaction score
0

Homework Statement



A circuit consists of a 50nF capacitor in series with a 47kΩ resistor. An AC voltage of 120Vrms at
350Hz is applied to the circuit.

(a) Determine the current flowing through the circuit.
(b) Sketch the impedance diagram for the circuit at this frequency.

Homework Equations



Xc , diagram , V = IZ

The Attempt at a Solution



First i found Xc = 1/2* pi* f * C

Then i did impedence diagram to find z and then use V = IZ to find Z

I got the answer: 2.51mA

But why it says answer is : 3.545sin(700π+11^0)mA ?
 

Discussion

Physics news on Phys.org
k31453 said:

Homework Statement



A circuit consists of a 50nF capacitor in series with a 47kΩ resistor. An AC voltage of 120Vrms at
350Hz is applied to the circuit.

(a) Determine the current flowing through the circuit.
(b) Sketch the impedance diagram for the circuit at this frequency.

Homework Equations



Xc , diagram , V = IZ

The Attempt at a Solution



First i found Xc = 1/2* pi* f * C

That is wrong. Check your lecture notes or books.


ehild
 
ehild said:
That is wrong. Check your lecture notes or books.


ehild

isnt it Xc = 1/ angular freq.* C ??
 
k31453 said:
isnt it Xc = 1/ angular freq.* C ??

Xc = 1/ angular freq.* C means 1/angular frequency, multiplied by C. Use parentheses: Xc=-1/(ωC) and do not forget, that Xc is negative.

Show your work in detail.

ehild