Resistors and heat?

[merr]

I'm doing coursework and i know it's dumb but i just cant remember how heat is supposed to affect resistors *heh* If someone could give me a quick explanation, it's not for the main part of the coursework, it's just a factor i have to controll in another experiment, but i can't remember why i have to controll it! D:

[Hootenanny]

http://www.google.co.uk/search?q=resistors+heat

[merr]

thanks, one more question, why would that affect the voltage in a circuit with a resistor?

[Hootenanny]

thanks, one more question, why would that affect the voltage in a circuit with a resistor?
Think about Ohms Law.