> 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).

But aren't R and V the only two of the three variables
that you can manipulate directly?  I depends on these,
right?  I think writing it I=V/R would be less confusing
to the novice.  With the V=IR form, I've seen
descriptions like "if the current doubles the voltage doubles."  Mathematically, yes, but it's not like you can
double the current independently of V and R.

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu