Impedance Problem

  • Thread starter k31453
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  • #1
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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 ????
 

Answers and Replies

  • #2
ehild
Homework Helper
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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
 
  • #3
58
0
That is wrong. Check your lecture notes or books.


ehild

isnt it Xc = 1/ angular freq.* C ??
 
  • #4
ehild
Homework Helper
15,543
1,914
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
 

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