Questions about charge flow and electricity

[te Toast]

I've just started GCSE physics. I'm pretty happy with everything on the course, but my physics teacher has given me a crazy homework which consists of simple questions about things that we haven't done in lessons. he says that we may need to research a bit, but I can't find anything with google or with bbc bitesize

The questions are ones like this:

• 
  The direction of the current in a metal is from the side at higher ....., to the side at lower ... This is called the .... current.

• When some chemical compounds are... or dissolved in ... they ... electricity.

On another page they're harder than just copy and complete. For example:

• 
  How much hydrogen is produced per coulomb of charge flowing around the circuit? [edit] (they give an example experiment)

I really have no idea about most of this and we haven't covered it in lessons. Could anyone link me to a good informative site where this subject is covered?

Thanks

 

[learningphysics]

Try http://en.wikipedia.com

Do searches on voltage, potential, ions, current etc...