# Electricity

posted by
**John** on
.

Just a quick one:

Is current (I) directly proportional to resistance (R) in a piece of resistance wire? Would the current - resistance graph be a straight line or a curve? Help greatly appreciated.

It would not be a straight line. For a fixed applied voltage V, current is

I = V/R

A graph of I vs R will be curved. It is called a hyperbola-shaped line

Thanks drwls :)