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Energy in RLC circuit

  • Thread starter CH1991
  • Start date
  • #1
27
0

Homework Statement



Please check picture

http://i.imgur.com/YMQBR.png

YMQBR.png


Homework Equations





The Attempt at a Solution



Shouldn't all the energy be 0 at beginning?
Thanks!
 

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Answers and Replies

  • #2
1,506
17
It tells you that this circuit is at resonance. Do you know what this means about the values of Xl, Xc and R.
 
  • #3
27
0
Xl = Xc

R = R....
 
  • #4
1,506
17
The question doesn't make much sense!
It is at resonance and that means:
1) Xl = Xc
2) Supply voltage and current are in phase
3) Supply voltage is the voltage across R
4) The power is dissipated in R
This means that you can calculate the value of R. You are given the resonant frequency so you can calculate Xc and therefore Xl.
I don't understand what they are asking !!!!
 
  • #5
ehild
Homework Helper
15,406
1,810
The problem asks about the energy stored in the inductor and in the capacitor, when the current is zero, so the voltage across the reactive elements is of maximum magnitude. You need the formula for the energy stored in an inductor and in a capacitor.
t=0 does not mean that the source was switched on at that instant. The generator voltage has been the same before we started to measure time.

ehild
 
  • #6
27
0
thank you!
 

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