The white wire goes by many names that all mean the same thing. There can be other colors of hot wires in some systems as well but black is the most common.
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Which wire is hot. In the most basic 110 volt electrical setup youll find two wires. Neutral common or return. A two wire plug uses a type a outlet. The two prongs provide a hot and neutral electrical connection. Power flows from the box to the outlet through the black wire and back to the box through the white one. The white wire is the neutral wire which takes any unused electricity and current and sends them back to the breaker panel.
Neutral wires should be white. If you see a black wire you should always assume its hot. Type b was created to provide a connection for an electrical safety system. If you have four then the black and red wires are both hot. The black wire is hot. The neutral wire is connected to an earth ground.
The type a plug has two flat parallel prongs and can fit in both styles of outlets. If there are three wires the wire with black insulation is hot. The standard color for your hot wire is black. The white wire is called the neutral wire. The black wire is the hot wire which carries the electricity from the breaker panel into the switch or light source. These outlets are the older version of the current type b outlet.
It provides the return path for the current provided by the hot wire. The black wire is the hot wire which provides a 120 vac current source. Look at the colors of the wires in your lamp.