Ohms' Law

[Welcome to the GWTW Forum]

Welcome to the GWTW Forum.
Guests (non-registered users) can view the forum but are unable to post.  If you don't have anything to say then why would you bother to register?
One of the most popular sections of the GWTW Forum has long been the Swap Meet.  A great place to sell old, seldom flown kites or to get great deals on used (gently flown) kites.  Only registered users can see the Swap Meet section, let alone wheel and deal.  1000's (literally) of kites have changed hands thanks to the Swap Meet.
There are several more benefits to being a registered user, but you'll have to join our little community to find out all the "secrets".
Questions or concerns?  forum.gwtwkites@gmail.com

[Zeke]

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. I will not be able to follow complex formulae..

www.setileague.org/askdr/imped.htm was the webpage I found it on..

[Stardragon]

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

[sluggo]

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

[Zeke]

I always had the understanding that an audio speaker had 8 ohms of impedance because of the presence of the magnet creating a field, whereas if you took the physical wire out of the speaker it would then measure ohms. I was also taught that resistance and impedance were the inverse of each other, almost.  thanks for the straightening out...but didn't SETI give up their search for radio signals being an indication of 'intelligent life' due to the attenuation of radio signals through space?

[chilese]

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. 

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.

[RonG]

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. 

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?

[Hadge]

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......

[chilese]

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.

[zippy8]

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

Mike,
sleeved.

[obijuankenobe]

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

For shame.

obi

Our forum is made possible by the good folks whose ads appear in the right margin of the forum and by the members of our community (PayPal donation button at bottom of the page)
In case you missed it each ad is linked to the sponsors web site.  So please, take a moment and visit our sponsors sites as this forum wouldn't be possible with out them. >>>
Interested in running an ad for your business or kiting event?  Contact Steve at advertise.gwtwkites@gmail.com for a quote.