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Author Topic: Ohm's Law  (Read 17403 times)
N3DF
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Posts: 252




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« on: May 09, 2013, 11:26:18 AM »

When I learned Ohm's Law (around 1961), it was E=IR.  Now it's V=IR.  When did that happen?
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Neil N3DF
K1WJ
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Posts: 460




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« Reply #1 on: May 09, 2013, 11:59:12 AM »

Last I knew it was still E=IR, V for voltage - no big deal, still calculates the same. 73 K1WJ David
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KE3WD
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Posts: 5689




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« Reply #2 on: May 09, 2013, 02:47:11 PM »

When I learned Ohm's Law (around 1961), it was E=IR.  Now it's V=IR.  When did that happen?

V = Volts = E = Electromotive Force

The I stands for Intensity, BTW.

As to why we are starting to see more use of the V, and even the C, instead of the E and the I, we are, after all, using a living language. 

73
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KD0REQ
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Posts: 1006




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« Reply #3 on: May 09, 2013, 02:59:14 PM »

one more old grump, I guess, who thinks that V instead of E is violating Ohm's Law.  I believe the penalty is I ^2 L
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AA4PB
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Posts: 12980




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« Reply #4 on: May 09, 2013, 03:07:52 PM »

It seems to me that if you are going to use "V" for volts then you should also use "A" for amps and "O" for ohms since they all represent units. So, V = AO  Shocked

Or, we could just stick with E, I, and R as originally specified since they all represent the things we are measuring rather than the units of measure.
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K7KBN
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Posts: 2825




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« Reply #5 on: May 09, 2013, 03:59:43 PM »

E = IR

E = MC²

Therefore, IR = MC².   Grin
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73
Pat K7KBN
CWO4 USNR Ret.
K8AXW
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Posts: 3958




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« Reply #6 on: May 09, 2013, 05:36:49 PM »

I wish you guys would knock off this line of discussion.  Some @#%&$#% idiot will want his 15 minutes of fame by talking the power-to-be into making this change..... like the idiot that managed to get cycles changed to hertz. 
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WB2EOD
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Posts: 219




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« Reply #7 on: May 09, 2013, 06:29:52 PM »

Twinkle, twinkle little star
E is equal to IR

Up above the world so high
P is equal to EI

Most important, Murphy's Law supersedes Ohm's Law, Newton's Laws of motion and Cole's Law (shredded cabbage, carrots mayonnaise)

73
WB2EOD
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KE3WD
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Posts: 5689




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« Reply #8 on: May 10, 2013, 05:05:38 AM »


Most important, Murphy's Law supersedes Ohm's Law, Newton's Laws of motion and Cole's Law (shredded cabbage, carrots mayonnaise)

73
WB2EOD

You left out the all-important V.

For Vinegar. 


73
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KK4PFQ
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Posts: 2




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« Reply #9 on: May 10, 2013, 03:22:43 PM »

..... like the idiot that managed to get cycles changed to hertz. 

I'm still haven't recovered from that one...

73
KK4PFQ
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N6AJR
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Posts: 9921




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« Reply #10 on: May 10, 2013, 03:49:32 PM »

yup 100 motorcycles sounds better than 100 motorhurts.
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N4NLQ
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Posts: 55




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« Reply #11 on: May 11, 2013, 09:11:18 AM »

How about the change from condenser to capacitor?  Since that changed the component from something that condenses a vapor to a liquid, to something that stores a liquid, shouldn't we have changed "Farads" to "quarts"?
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K0OD
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Posts: 2578




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« Reply #12 on: May 11, 2013, 01:19:34 PM »

Quote
"like the idiot that managed to get cycles changed to hertzt managed to get cycles changed to hertz"

"That idiot" was an international conference in 1930!

One could argue Hertz was the first ham! As has been discussed on Eham,  the VERY appropriate use of Prof Heinrich Hertz's name was delayed mostly by WW2. The German's used "Hertz" rather than "cycles" long before we did.

Wikipedia: "The name was established by the International Electrotechnical Commission (IEC) in 1930.[6] It was adopted by the General Conference on Weights and Measures (CGPM) (Conférence générale des poids et mesures) in 1960, replacing the previous name for the unit, cycles per second (cps), along with its related multiples, primarily kilocycles per second (kc/s) and megacycles per second (Mc/s), and occasionally kilomegacycles per second (kMc/s). The term cycles per second was largely replaced by hertz by the 1970s."

I believe that most of the other radio/electronics SI's have also had multiple names over the decades.
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G3RZP
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Posts: 4834




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« Reply #13 on: May 11, 2013, 01:28:45 PM »

Isn't 'Ohm's law' government housing policy?
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KC9TNH
Member

Posts: 304




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« Reply #14 on: May 11, 2013, 07:44:40 PM »

I teach Ohm's Law as E=IR and that is what is on my Ohm's Law "T" Shirt so, no reason to change in my humble opinion. 
The important thing is that the shirt is changed; periodically anyway.
 Grin
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73
Wes -KC9TNH
"Don't get treed by a chihuahua." - Pete
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