A simple question about electricity......

["Gerald Brazil" <gerrybraz@voyager.net>]

I would appreciate a simple explanation of typical wiring....

A basic 110v circuit consists of a hot wire (black), a common wire (white)
and a ground wire (green)

A 220 v circuit consists or two hot 110v wires (one black and one red) and a
ground wire (green).

Why doesn't a 220v circuit need a common? How is the circuit completed?

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