## Search found 6 matches

Sun Oct 31, 2010 7:26 pm
Forum: High School Physics
Topic: npn and pnp transistors
Replies: 1
Views: 9403

### npn and pnp transistors

Hello!

Apologies if this topic is already covered, I searched the forum and didn't find anything.
I was wondering if you could explain how npn and pnp transistors work. I know they are basically p-n junctions, but my book's explanation confused me....

A basic explanation will do.

Thanks heaps!
Sat Oct 30, 2010 7:09 pm
Forum: High School Physics
Topic: Semiconductors
Replies: 1
Views: 9778

### Re: Semiconductors

Also, if the conduction band and the valence band are energy levels; does that mean that the electrons that are extra/unpaired have greater energy because they occupy the conduction band?

Thanks
Sat Oct 30, 2010 7:05 pm
Forum: High School Physics
Topic: Semiconductors
Replies: 1
Views: 9778

### Semiconductors

Hi, Could you explain what it means to reach the conduction band in terms of n-type semiconductors. What I mean is : i know that the n-type semiconductors are doped with a group 5 atoms, so that the 4/5 electrons pair with the 4 valence electrons of the semiconductor atom. Hence, in order for curren...
Sat Oct 09, 2010 4:04 am
Forum: High School Physics
Topic: 3 phase electricity
Replies: 1
Views: 9538

### 3 phase electricity

Hi Joe,

Can you please explain how 3 phase electricity works? And I dont get how you can synchronize the stator coils in a generator and those in a motor to produce it....

Thanks heaps!
Wed Oct 06, 2010 8:50 pm
Forum: High School Physics
Replies: 2
Views: 10197

Hey Joe,

FOr the HSC do we really need to know about the twin paradox? Because I couldn't find it on the syllabus doc....

Thanks
Sun Oct 03, 2010 2:55 pm
Forum: High School Physics
Topic: E=mc^2
Replies: 1
Views: 9349

### E=mc^2

Hey!

Could you please explain how E=mc^2 is a consequence of special relativity?