Question

The resistivity of gold at room temperature is 2.35 × 10-8 Ω×m. The temperature coefficient a = 3.98 × 10-3/K. What will be the resistivity of a piece of gold whose temperature is 150°C above room temperature?

Answer 1

Have a look at @Aditya790 explanation on this link. http://openstudy.com/study?login#/updates/4f9e0ac6e4b000ae9ed27746 . You will get your answer

Answer 2

The coefficient of resistivity tell you a tells you how the it grows for every degree change in temperature. It is much like velocity, it tells you rate of change of resistivity.
You know how much it changes every degree and since you changed it by 150 *C, you can figure out how much it changes.

Answer 3

I'm srry but I didn't get it

Answer 4

what did you not understand? I'll see if I can clear it up for you.

Answer 5

You said that the change in temp is related to the temp coefficient, but then how can i get the resistivity

Answer 6

Well, what is resistivity?

Answer 7

Or rather, what do you think it is?

Answer 8

It is not related to resistivity, the explanation of what alpha is happens to be similar to what resistivity coefficient is.

Answer 9

All I know is that resistivity is a property of the material that shows the resistance ability of the material

Answer 10

Well, here's how it is.
Resistance is a number that will tell you something about the hindrance offered to flowing electrons (that is electric current).
Resistivity is the resistance of a unit length of wire and of unit cross section.
Resistivity coefficient is how much the resistivity will increase when you increase temperature by 1 degree Celsius.
Does that help?

Answer 11

Alot indeed
thnx =)

Answer 12

Good. And I think you could use a little revision on this chapter, just get a feel of what resistance is and all those other things which affect current flow.

Answer 13

I will and actually I should, but really thnx alot