Black, white, and copper.
A 120 volt duplex outlet is the main type of outlet for residential outlet system. The wires are typically white and black, and there should only be two of them.
A duplex outlet is 115vac.
Electrical wall outlet having two plug receptacles.
No. You can split the hot feeds and you can split the neutral feed, but both outlets of a standard duplex receptacle share the ground.
Call an electrician.
On what? IS this an outlet or a switch?
If there is a black wire going from the outlet to the switch and the other side of the switch goes back to the outlet then just cut these wires and connect supply wire directly to outlet. If the supply goes to the switch first, disconnect from switch and connect the two wires with a wire-nut. Some situations only switch one of the two outlets in a duplex device. Do the same thing, but also replace the outlet since the strapping between both outlets has been removed.
If it is a duplex receptacle then two cords is the maximum that should be connected to it.
Just firmly connect the wires under the screws and that will couple them. Each outlet has two hot and two neutral screws; just connect the wires appropriately and make certain that the outlet is properly grounded.
It is an outlet that has one hot wire, such as a household receptacle, or two hot wires, such as a dryer outlet (in the US). If the outlet has three hot wires, it would be called a 3-phase or polyphase outlet. These would normally be found only in an industrial setting.
A 3 wired electrical fixture includes positive, negative and ground. The ground can be attached to one of the screws in the wall. In the case of the other wires, matching the colors, twisting and capping the wires together will handle the electrical installation.
A power outlet can be wired int a cigarette lighter. The wires will have to be cut, with the power off. Then the wires will need to be connected back together while adding the power outlet wires. The Connection will have to be a proper connection, preferably with crimp connectors.