Why can't Ohm's law be described in terms of "constant proportionalty"?

Question

Why can't Ohm's law be described in terms of "constant proportionalty"?

Answer 1

because all the vairables constantly change volts watts amps ect, as in ohms law , it applys only for that moment

Answer 2

It can be, for most resistors R is a constant that can have any value. However, some devices, like semiconductors, change resistance also.

But, this is really just sematics. How does this description make it any clearer than E=IR?

Answer 3

I agree: it is question = answer. It makes more sence, and a h**l of a lot easier to grasp.

I=V/R

V=IxR

R=V/I

Answer 4

ohm's law says, V = R*I

so, V depends on two variables, R and I.

a law can be stated as constant of proportionality if a variable depends on only one variable. that however isn't the case here.