How does resistance change with temperature for Ohmic conductors and filaments?

[GingerPrince]

Homework Statement

How does does resistance vary with temperature for an Ohmic conductor and filament?

Homework Equations

The Attempt at a Solution

So what I know is that resistance(Ohms) against temperature(K) for an Ohmic conductor is directly proportional with the graph passing through the Origin and being a straight line.
And for a filament, the resistance is directly proprtional for a range of temperatures and then decreases with the graph having a decreasing gradient.
Note this is Grade 11 level. I HAVE AN EXAM :(

 

[CWatters]

Ohmic conductor - obeys Ohms law. So the resistance is constant and independent of temperature.

Filaments in a light bulb are typically made of Tungsten. In metals the resistivity typically rises with temperature, particularly at high temperatures.

http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity#Metals