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03-22-2009, 10:05 PM   #31
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Quote:
 Originally Posted by HandyPete Sorry I don't have the time nor the talent to explain just how far off this remark is. Z does not equal E/I !!!! and no, you cannot measure the DC resistance to find reactance...NOT! (hint: iron has something to do with the answer) _pete
If I remember correctly, it has more to do with number of turns than iron.

03-23-2009, 09:51 AM   #32
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Quote:
 Originally Posted by HandyPete Sorry I don't have the time nor the talent to explain just how far off this remark is. Z does not equal E/I !!!! and no, you cannot measure the DC resistance to find reactance...NOT! (hint: iron has something to do with the answer) _pete
Z=E/I=R + jXL
We already know Z. Once you know R you can calculate XL (at 60 Hz), and you know XL "is at right angles" to R.

If R = XL = 4500 ohms then Z would = 6364/45°
It's vector algebra.

Probably, though, the Z is somewhat dependent on the position of the iron slug in the solenoid.

Last edited by Yoyizit; 03-23-2009 at 10:01 AM.

 03-23-2009, 01:12 PM #33 Member   Join Date: Mar 2009 Posts: 780 Rewards Points: 500 The number of turns in the coil will have a greater effect on the inductive reactance than the iron core.

03-23-2009, 08:01 PM   #34
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Quote:
 Originally Posted by hayewe farm The number of turns in the coil will have a greater effect on the inductive reactance than the iron core.
Wiki seems to agree with you, with the N^2 term in the formula.

Finding a formula for a coil with a core having a high permeability seems to be a little more difficult.

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