# converting henries to ohms

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

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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$\pi$f*L.
called inductive reactance.
Where f is the frequency of the voltage applied.

(reactance and resistance aren't the same)

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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,
= ''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.

Mar 31, 2012
24,247
7,558

6. ### crutschow Expert

Mar 14, 2008
22,242
6,490
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
4,868
1,364
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
22,242
6,490
That's only after you divide the applied voltage by the measured inductor current for a period of one second.

9. ### MrAl AAC Fanatic!

Jun 17, 2014
6,089
1,310
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

10. ### WBahn Moderator

Mar 31, 2012
24,247
7,558
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.

11. ### WBahn Moderator

Mar 31, 2012
24,247
7,558
You might want to check again. A 1 uH inductor has a reactance of about 0.628 Ω at 100 kHz.

If you post a link to where you got that claim, we can discuss it.

Lose the attitude, otherwise you will be gone.

12. ### MrAl AAC Fanatic!

Jun 17, 2014
6,089
1,310
Hi,

Are we all in a DeLorean today by any chance?

nsaspook and jpanhalt like this.
13. ### jpanhalt Expert

Jan 18, 2008
7,263
1,633
From what century is Nashimel Nexus?

Perhaps this thread needs to be truncated at April 24, 2018.

Edit: Fixed dyslexic date.

Last edited: Apr 24, 2019
MrAl likes this.