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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 :)

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