1.    i) How are batteries made?
      ii) What does batteries look like?

2.   I would like to know how one starts up a superconducting magnet. I know it has to be cooled below the critical temperature, and I think it has to be a closed loop, so I'm wondering how you introduce the current. Inductive coupling with a normal coil seems the most likely, but I haven't been able to get through the details.

3.   What does PMPO (audio systems) power mean and what is the relation between PMPO power and RMS power?

Four identical light bulbs are connected in the circuit shown (click here to see the circuit).
Which two light bulbs glow with the same brightness?
A W and X B Y and Z C X and Z D W and Y