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Hi,Once again, I'll have to protest...Either you use V, A and Ohm or their symbolic representations U(or E), I and R - please be consequent and stop mixing real and symbolic names

Perhaps i'm misunderstanding, but are you saying to write the equation 'V=IR' is a mixture?

Quote from: Soeren on March 11, 2010, 03:13:51 PMHi,Once again, I'll have to protest...Either you use V, A and Ohm or their symbolic representations U(or E), I and R - please be consequent and stop mixing real and symbolic names Perhaps i'm misunderstanding, but are you saying to write the equation 'V=IR' is a mixture?

I must be really stupid, but wat is a mixture?

If you want to know the current of a 9V battery, then you would say:I = V / R

I asked this question because lets say I have a 500milliamp LED and a 9V battery, what resistor would I need?

Unfortunately, it is becoming more and more common to see V use in Ohm's law. I have seen this in college text books as well as many, many places on the web including Wikipedia.http://en.wikipedia.org/wiki/Ohm%27s_lawI know you are correct Soren but this is going to became the standard form of Ohm's Law.

I was taught V=IR all throughout school.

I tried googling for R=U/I but couldn't find any information on it.

Ahh, makes sense, it's one of those 'times are changing' things. I just checked all my old text books and they are all V=IR with publish dates near 2000, so I guess it's been in a state of flux for a while. In the 4 years of EE degree, I never saw the use of U or E for volts. It was always V.

I think neither usage is wrong at this point. Googling Ohm's Law and the first few links, (wikipedia and NASA) both say V=IR; and I was taught by some very smart people.

When I Google Ohms Law, the first hit it this page at Wikipedia stating I = U / R(which isn't Ohms Law, as that is R=U/I )

Either you use V, A and Ohm or their symbolic representations U(or E), I and R - please be consequent and stop mixing real and symbolic names

This is what i see when i click your link. [Snip]So i don't know if you are getting a UK version of wikipedia but there's no U there, just a V. I=V/R

I hope this doesn't keep you from giving me any advice in the future.

Oh well, too bad I didn't make a pic of it, but I didn't think that someone would stoop so low as to make a redirect or whatever, just to prove a missing case, but the edit date ("This page was last modified on 11 March 2010"), sort of give it away