Capacitor and Inductor in Series

Click For Summary

Discussion Overview

The discussion revolves around the behavior of a capacitor and inductor connected in series to an alternating supply, specifically focusing on their reactances and how they combine in this configuration.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant, Richard, inquires whether the reactances of the capacitor and inductor add up when connected in series.
  • Another participant asserts that reactance behaves like resistance in resistive circuits, suggesting they add up.
  • A different participant argues that capacitive reactance is 180 degrees out of phase with inductive reactance, indicating that they should be subtracted rather than added.
  • There is a clarification regarding the distinction between reactance and impedance, with a participant questioning why reactances are being considered instead of impedances.
  • One participant provides a formula for the impedance of the series circuit, reinforcing the idea that the reactances subtract from each other.
  • A participant expresses confusion about the formula and their own wiring of capacitors, indicating a lack of understanding of the concepts involved.

Areas of Agreement / Disagreement

Participants express differing views on whether the reactances add or subtract, with no consensus reached on the correct approach to combining them in the context of alternating current.

Contextual Notes

Some participants demonstrate uncertainty regarding the definitions and relationships between reactance and impedance, as well as confusion about specific formulas and their applications.

Who May Find This Useful

Individuals interested in electrical engineering, particularly those studying AC circuits, may find the discussion relevant.

richardstan
Messages
13
Reaction score
0
Hi, if you have a capacitor and inductor in series connected to an Alternating Supply, do their reactances add up?
Thanks
Richard.
 
Physics news on Phys.org
Yes, reactance behaves just like resistance in resistive circuits.
 
Ummm, they add like this 5 & 4 = 1.

Capactitive reactance is 180 degrees out of phase from inductive reactance, so you actually subtract one from the another.

It's good to go back to the definitions. In series,

Z= i\omega L + \frac{1}{i\omega C}

where X_{L}=Im(Z)
 
Last edited:
I miswrote, sorry. I thought I saw "impedance" instead of "reactance". But why are you considering reactances and not impedances? The former is part of the latter.
 
I have a generator that needs a new capasitor and I cannot find one any where! can someone tell me what size I need for a kawaqsaki 5.0 ops FA210D modle number: GGK-26-B serile number KJ19-78B
KW: 2.65 Amps:22 KVA: 2.65 Phase:1
voltage: 120 RPM:3600
HZ: 60
would appreciate anyons help!
russhart70
or give me a formula,? PLZ.
 
Phrak said:
Z= i\omega L + \frac{1}{i\omega C}
= i\omega L - \frac{i}{\omega C}

because: 1/i = -i

So, they subtract.
 
it has been 12 years since i graduated collage, and can't quit understand the formula, I wired two capasitors together and now I am pushing 175 volts out of this generator? cannot rember wat I did?? I am a licenced electrician, and I guess its been to long since I have had to figure this stuff out!
 
goin to get my books out real quick!
 
do not understand wat L = wat I know is P=wats I = amps E=volts R=omes
 
  • #10
I guess I AM
 

Similar threads

  • · Replies 9 ·
Replies
9
Views
409
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 18 ·
Replies
18
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
Replies
152
Views
7K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K