# Thread: Why do CPU's get hot ?

1. I still dont know if this is a serious question or not?... LOL.

2. Of course there is friction, just just mostly induced my angular momentum.

3. they should use some sort of lube to reduce friction.

4. Because Chuck Norris wants them to get hot!

5. because the computer is on.

6. Originally Posted by Elmy
Why do CPU's get hot ?....
Why do you get hot??

7. CPUs don't eat curry

8. Originally Posted by Cooper
You do realize that space between atoms is thousands times greater than size of electron right ?
There is no friction on that scale.

Alright you can't say everyone is wrong, make fun of them, and then not answer the question. Come on guru, why do CPUs get hot?

9. Originally Posted by trans am
because the computer is on.

10. Largely due to impedance (i.e. resistance) http://en.wikipedia.org/wiki/CPU_power_dissipation

11. "Friction" might not be the right word but the basic concept is the same. Heat generated in a CPU (or any other electrical device) derives from electron collisions with the conductor and the resulting loss of kinetic energy. Transistors also produce more heat than simple resistance in a wire for example, because of the way they operate, pack millions of them into a CPU and you have a nice source of heat.

12. imagine tiny billions of switches... switching fast lol

anybody studied logic circuits here? or alittle vlsi?

13. It's physically impossible for them to run cooler than ambient!

Why?

Because Chuck Norris said so! [full stop]

I win, what's the price?

14. Originally Posted by G H Z
"Friction" might not be the right word but the basic concept is the same. Heat generated in a CPU (or any other electrical device) derives from electron collisions with the conductor and the resulting loss of kinetic energy. Transistors also produce more heat than simple resistance in a wire for example, because of the way they operate, pack millions of them into a CPU and you have a nice source of heat.
Dont even need collisions, just magnetic fields passing by each other.

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