the metal
Im not really sure? If i was asking why would i put the answer
Aluminum will conduct both electric current and heat, so it would be a bad insulator of either.
Because neurons are the only cells that can conduct electric current, answer to your question would be neurons.
No, I wouldn't. It is more like a insulator, not a conductor. Silver conducts electricity the best. If a current were put through cardboard, it would most likely catch on fire, not conduct electricity.
An example of a good insulator of electricity would be rubber. An insulator is anything that does not conduct electricity and as such offers protection from direct electric current.
Non-metals in general do not conduct electricity or other forms of energy as well as metals do. Helium would be an example.
Infinity
I presume you mean what do you measure electric current with. You would use an ammeter.
The temperature of the wire will increase and eventually like the "straw breaking the camel's back" the wire will fail if you apply enough current. It is like exceeding the current in a fuse, the wire essentially disintegrates.
Camera Flashlight Can Never Conduct electricity as Flash light (Photons) can never conduct (Electrons) Electric Current. Please don't believe in any amazing stories over internet without proof since if light would have conducted electricity life would have eased to exist on earth. If you want to see wireless electric transmission please visit the Ted Talk and this page http://thetechjournal.com/science/new-technology-for-conducting-current-without-any-power-lines.xhtml
There would be no electric field
Gold would conduct electric current and could not be used for the case, but it would cost a few thousand dollars per oz of gold used to coat an existing case