But I is only the dependant variable in *one* way of looking at it. V=IR is
the appropriate way of writing it if you consider ohm's law to mean " V =
the voltage drop across resistance R with current I passing through it". You
can come up with a similar, equally valid phrase, for the third way of
writing it out (r=v/i).

I was tought to remember ohm's equation in the same way as the
distance=speed.time thing:- picture a triangle like this:-


        D
    -----
    S | T

If you cover up the value you want to find with a finger, the layout of the
other 2 gives you the form of the equation.


        V
   -------
    I | R

Ie. Cover up I, and you see V over R.

Jon

> -----Original Message-----
> From: Rick Regan [mailto:drrdr@CHARTER.NET]
> Sent: 15 April 2004 15:14
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Why isn't Ohm's Law written I=V/R?
>
>
>   Does anyone know why Ohm's law is writtem V=IR (E=IR)
> instead of I=V/R?  Of course I know they're equivalent.
> I just wondered why - if I is the dependent variable and V
> and R are the independent variables - it's basic form
> isn't I=V/R.
>
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