ECN Forum Forums General Topics of the Trade General Discussion Area ohm's law , low voltage also?

George Simon Ohm.(March 16,1789-July 6,1854)

E=IR, I=E/R, and R=E/I are all Ohm's Law, just stated in different ways.
Watt's law is W=IE(orV) or W=I^2V (that's "I" squared)

This is correct as V is the same as E. It is your (EMF) ElectroMotive Force or Volts. So yes that is correct.

Sorry about going multilingual there. Indeed, E == V. (Please hold the remarks about being a cunning linguist.)

Yes, Please do.

Bill

By reading some of the responses I thought I would chime in with a little more.

In school they have shown us 12 different formulas for finding whatever it is you want to find. There are several variations and now they are gradually going into inductance and capacitance. Doesn't really apply here though.

Anyway the basic that everyone has listed is:

E = I x R

I = E / R

R = E / I

then we have:

P = I x E

I = P / E

E = P / I

from these two formulas above they have shown us how to break these down to get 6 more formulas.

E² = R x P

R = E² / P

P = E² / R


and then we have:

P = I² x R

I² = P / R

R = P / I²


They all work if you give them a shot. I know it has helped is school by being able to go through the "backdoor" on some problems. Enjoy.

* edited because I can't spell this early in the morning*

[This message has been edited by GA76Apprentice (edited 12-12-2004).]

By the way,
There is no such thing as the common thinking "Watts Law".
As any free thinking person will tell you, James Watt invented, among other things, the Steam Engine, the term "Watt" and it's multipliers, was applied after his death.
It was actually Edison that came up with the Power Calculation that we call Watt's Law.