You can use the ohms law to find the current using the voltage and resistance. What would the resistance of a circuit be without resistors? I'm using relatively short copper wire.

 

If you have the wire gauge or a micrometer - http://en.wikipedia.org/wiki/Electrical_conductivity

 

Copper wire has a pretty low resistance, but resistance depends upon what the circular mils dimension of the copper portion of the wire is.

Here is one calculator:
http://www.stealth316.com/2-wire-resistance.htm
Another calculator:
http://www.powerstream.com/Wire_Size.htm

 

Nearly everything has some resistance even a short length of large copper wire.

 

Nearly everything has some resistance even a short length of large copper wire.

It would be safe to say that absolutely everything has some resistance except for superconductors (by definition).
Der Strom