How Does Doubling Frequency Affect R-L-C Series Circuit Components?

Click For Summary

Homework Help Overview

The discussion revolves around the effects of doubling the frequency in an R-L-C series circuit, specifically focusing on how this change impacts resistance, inductive reactance, and capacitive reactance.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the relationships between frequency and the reactances of inductors and capacitors, questioning whether resistance is affected by frequency. They discuss relevant formulas and express confusion about which to apply.

Discussion Status

Some participants have provided guidance by reiterating the formulas for reactances and resistance, while others are attempting to clarify their understanding of how frequency influences these values. There is an ongoing exploration of the implications of doubling the frequency.

Contextual Notes

Participants note the lack of additional information and express uncertainty about the dependency of resistance on frequency, which is a key point of discussion.

meryom
Messages
5
Reaction score
0
If the frequency of a source is doubled in a R-L-C series circuit,what will happen to the resistance ,the inductive reactance and the capacitive.

Homework Equations


f=1/2pi√LC
XL=2.pi.f.L
XC=1/2.pi.f.C
R=Vrms/Irms
i coludn't know which formula to use am confused please help ...
 
Last edited:
Physics news on Phys.org
The RLC circuit is being driven by a source with frequency f. What are the values of the reactances for the inductor and capacitor? Does the resistor's impedance depend upon frequency?

Oh, and welcome to Physics Forums!
 
thanks :) ...sorry nothing else is given ...and i think it depend since z=√(xl-xc)^2+R^2
and xl=2.pi.(f).L and the same for xc=1/20pi.(f)c
 
You have enough information to answer the question. You've already written the required formulae several times!

If I were to ask you to write the formulas for the reactances of an inductor and a capacitor and the resistance of a resistor given that the frequency is f, what would you write?

XL(f) = ?
XC(f) = ?
R(f) = ?
 
i would write the above formulae ...so should i solve for frequency(by doubling it ) using the above formulae ?...what about for R ?
 
meryom said:
i would write the above formulae ...so should i solve for frequency(by doubling it ) using the above formulae ?...what about for R ?

The question asks you to state what happens to the reactances when the frequency is doubled. In order to do that, you must observe how the reactance values depend upon the frequency variable in the formulas.

Also, does R depend upon frequency? Is there any "f" value in the expression for resistance?
 
Also, does R depend upon frequency? Is there any "f" value in the expression for resistance?[/QUOTE]

i don't think so ..??
 
meryom said:
Also, does R depend upon frequency? Is there any "f" value in the expression for resistance?

i don't think so ..??[/QUOTE]

Right, an ideal resistor's value is independent of frequency. Now you know! :smile:
 
ok !really thank you , i get it now ... ;)
 
Last edited:

Similar threads

  • · Replies 21 ·
Replies
21
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
2
Views
2K
  • · Replies 10 ·
Replies
10
Views
1K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
997
Replies
3
Views
1K