Standard Wire Gauge (SWG) are used for selecting the appropriate diameter wire for a specific purpose. A wire gauge is a quick and easy way of identifying the thickness of a wire for artwork and construction. Using a wire gauge can help you identify the size of an unknown wire you may have.
"0-36" is the possible range to measure the size of the wire in a Standard Wire Gauge (SWG).

18 electrons are there in the third shell of copper atom.

Kirchhoff's Voltage Law or Kirchhoff's Second Law states that “in any closed loop network, the total voltage around the loop is equal to the sum of all the voltage drops within the same loop” which is also equal to zero.