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Author Topic: Ohms' Law  (Read 1414 times)
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Zeke
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« on: August 03, 2011, 07:04 AM »

I thought Ohms Law was e=ir, which was taught in the electronics class in the service. recent reading from 'Ask Dr. SETI indicates that Ohms' Law now is Z=e/i..  is this if strictly applied to electronic emanations passing through space. Huh I will not be able to follow complex formulae..

www.setileague.org/askdr/imped.htm was the webpage I found it on..
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Stardragon
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« Reply #1 on: August 03, 2011, 08:39 AM »

e=ir
i=e/r
r=e/i

It's the same equation solved for each of the different variables.  Z would represent impedance for you.

Ron
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sluggo
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« Reply #2 on: August 03, 2011, 08:44 AM »

Z (impedance) is the generalized form of r (resistance), otherwise it's the same equation. Z is not just used for waves traveling through space though -- it's a property of any electrical device.

The math gets slightly harder, but it's conceptually simpler -- resistors, capacitors, and inductors all become the same sort of "thing", just with different equations describing their impedances. Explained pretty well here:

http://en.wikipedia.org/wiki/Electrical_impedance
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chilese
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« Reply #3 on: August 03, 2011, 01:31 PM »

Way back before computers and texting and HDTV and Britney Spears.....

ELI the ICE man

Voltage (E) leads Current (I) in an Inductor (L) { speakers, transformers, etc }

Current (I) leads Voltage (E) in a Capacitor (C)

This refers only to AC and is often mentioned with a phase angle of lead or lag.

Z is a combination term incorporating all the factors of resistors, capacitors and inductors.

This was written without looking up anything so feel free to correct any of the above.  Smiley

As far as 8Ω speakers go, the impedance of any speaker is dependent on the frequency driving it. Typically, the "resistance" of a speaker is very high at low frequencies and goes down quickly to an almost shorted condition at higher frequencies.

« Last Edit: August 03, 2011, 01:36 PM by chilese » Logged

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RonG
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« Reply #4 on: August 03, 2011, 02:42 PM »

Way back before computers and texting and HDTV and Britney Spears.....

ELI the ICE man

Voltage (E) leads Current (I) in an Inductor (L) { speakers, transformers, etc }

Current (I) leads Voltage (E) in a Capacitor (C)

This refers only to AC and is often mentioned with a phase angle of lead or lag.

Z is a combination term incorporating all the factors of resistors, capacitors and inductors.

This was written without looking up anything so feel free to correct any of the above.  Smiley

As far as 8Ω speakers go, the impedance of any speaker is dependent on the frequency driving it. Typically, the "resistance" of a speaker is very high at low frequencies and goes down quickly to an almost shorted condition at higher frequencies.


So are you saying that sleeving lines is good or bad?
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Hadge
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« Reply #5 on: August 03, 2011, 02:45 PM »

I always thought that Ohms law was the further you were from Ohm the more likely it was that your car would break down!........Sorry......
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chilese
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« Reply #6 on: August 03, 2011, 03:00 PM »

Sleeving is always bad.

Badbadbad. Superbad. Uberbad.

However, if I buy lines with sleeves, I leave them on, but set the knot very hard to punish the sleeving.
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zippy8
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« Reply #7 on: August 03, 2011, 08:15 PM »

Only those who practice transcendental meditation are subject to Ohm's Law.

Mike,
sleeved.
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« Reply #8 on: August 04, 2011, 04:04 AM »

I am not sure that amount of corn is allowed when posting on GWTW.  And that from a moderator. 

For shame.

obi
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