A thickness of wire or metal.
Metal wire
Of itself a metal can not be "shortened". However, a metal OBJECT such as a piece of metal wire can be shortened by cutting a piece off. This would be a physical change.
Most electrical coils and solenoids, use copper wire.
A wire is a conductor. It is usually coated with an insulator to isolate the current flowing in the conductor portion of the wire from other things around the wire, like your hand.
Physical. The metal wire is still a metal wire after the change.
In most cases, copper is the metal used in wire.
The thickness of metal wire is inversely proportional to the guage number of the metal wire. So 28 guage metal wire is thicker than 30 guage metal wire.
yes its a metal
metal
You melt the metal and pour it into a thin mold the size of the wire you want.
Physical. The metal is still metal, even though now it's wire-shaped.
Rough, rough, rough! (Dogs can be very sensitive.)
Electricity+Metal=Wire
Connect the ground wire to the metal box.
cause the molecules in the metal are squeezed tight together
*the resistivity of the metal the wire is made of *thickness of wire *length of wire