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Capacitor and Inductor in Series

  1. May 19, 2008 #1
    Hi, if you have a capacitor and inductor in series connected to an Alternating Supply, do their reactances add up?
  2. jcsd
  3. May 19, 2008 #2


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    Yes, reactance behaves just like resistance in resistive circuits.
  4. May 19, 2008 #3
    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,

    [tex]Z= i\omega L + \frac{1}{i\omega C}[/tex]

    where [tex]X_{L}=Im(Z)[/tex]
    Last edited: May 19, 2008
  5. May 20, 2008 #4


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    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.
  6. Aug 14, 2010 #5
    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 appriciate anyons help!
    or give me a formula,? PLZ.
  7. Aug 14, 2010 #6
    [tex] = i\omega L - \frac{i}{\omega C} [/tex]

    because: 1/i = -i

    So, they subtract.
  8. Aug 14, 2010 #7
    it has been 12 years since i graduated collage, and cant 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!
  9. Aug 14, 2010 #8
    goin to get my books out real quick!
  10. Aug 14, 2010 #9
    do not understand wat L = wat I know is P=wats I = amps E=volts R=omes
  11. Aug 14, 2010 #10
    I guess I AM
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