converting henries to ohms

Discussion in 'Homework Help' started by redshaw, Jul 15, 2008.

  1. redshaw

    Thread Starter Member

    Jul 15, 2008
    12
    0
    is it possible to convert henries to ohms?

    as one is quantity a of inductance and one resistance?

    i have searched the web for the equal but to no avail

    trying to convert 1.5 H to ohms

    cheers
     
  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    1
    An inductor of L(in Henry) inductance offers reactance Xl (in Ohms) given by
    Xl = 2\pif*L.
    called inductive reactance.
    Where f is the frequency of the voltage applied.

    (reactance and resistance aren't the same)
     
    -live wire- likes this.
  3. Ratch

    New Member

    Mar 20, 2007
    1,068
    4
    redshaw,

    No, as you noted, they are two different things. At an AC frequency, henries produce a reactance which is measured in ohms, but it still is a different quantity than resistance ohms. So you have two strikes working against their equivalence. Ratch
     
  4. ziggy stardust

    New Member

    Apr 22, 2018
    1
    0
    Hello redshaw,
    Do you have some answer:
    > for your question:
    = ''How to convert 1,5 Henry in Ohms.?''
    Because I answer the same question..
    Please, if you got any answer thince the time, tell me some..
    I need it..
    Thanks a lot for an answer..
    A guy in France..
    Bye, Ziggy Stardust.
     
  5. WBahn

    Moderator

    Mar 31, 2012
    22,620
    6,729
    I wouldn't hold my bread expecting the starter of a decade old thread to answer you.

    Instead, study up on inductive reactance in your text book and, if you are still having problems, start a thread so that YOUR problem can be addressed.
     
  6. crutschow

    Expert

    Mar 14, 2008
    19,122
    5,345
    Inductors have an impedance that is proportional to the frequency of the applied voltage.
    This impedance does not dissipate any power from current going through this impedance.

    Resistors have a resistance that does not change with frequency.
    Power is dissipated by current going through this resistance.
     
  7. Jony130

    AAC Fanatic!

    Feb 17, 2009
    4,429
    1,256
    The unit of a inductance is a 1H - henry.
    Therefore 1H = V *s/A = Ω*s
    So, to get Ohms divide by one second.
     
  8. crutschow

    Expert

    Mar 14, 2008
    19,122
    5,345
    That's only after you divide the applied voltage by the measured inductor current for a period of one second.
     
  9. MrAl

    Distinguished Member

    Jun 17, 2014
    4,942
    1,061
    Hello,

    If you subtract the current year (2018) from the year of the first post (2008) you get -10 year-ohms per ohm :)
    Try to convert that to years if you like :)
    Or to decades :)
     
  10. WBahn

    Moderator

    Mar 31, 2012
    22,620
    6,729
    As you say (or said about a decade ago, but for the benefit of the revived discussion), they are different things.

    In fact, there are two different things that both have the same unit, namely ohms. These are resistance and reactance. While both are the ratio of a voltage and a current, that's largely where the similarity ends. A resistance is the ratio of the instantaneous voltage across the device to the instantaneous current through the device and it is a property only of the device; a reactance is the ratio of the amplitude of a pure sine wave of the voltage across the device to the amplitude of the a pure sine wave of current through the device and is a function of the frequency of the signal as well as the inductance of the device. Furthermore, a resistance always dissipates power whenever there is voltage across it or current through it, while a reactance never does (on average over an integral number of periods), rather it is able to store energy from the circuit temporarily during one part of the waveform and give it back tot he circuit during another part.

    There's actually three different things measured with the unit ohms if you consider impedance, which is a linear combination of the other two.

    The inductance of a device, usually measured in henries, can be related to the reactance of that device, usually measured in ohms, but that that does not make them the same thing, so you are not converting one to the other (in the sense that you convert meters to miles. Think of it like the speed of a car and the distance traveled. These are not the same thing, so you don't "convert" speed to distance. Instead, they are related via a third quantity, namely time. So if you know the speed of a car and the time that it has been traveling at that speed, you can calculate how far it has traveled in THAT amount of time. For an inductor, if you know the inductance and the frequency of the signal applied to it, then you can calculate the reactance of the inductor at THAT frequency.
     
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