If the existing receptacle or switch is connected through the holes in the back, push a jewelers screwdriver or similarly shaped tool into the slot next to each hole to release the clamp pressure and pull the wire free.
A pipe through which an electrical cable is run to protect it from damage. Conduit is available in metal and pvc plastic. Conduit is required in places like unfinished basements where electrical wiring is exposed and therefore vulnerable to damage.
The force or pressure that causes electricity to flow, measured in volts. Voltage is also called Electromotive Force (EMF) and is cause by the potential difference in voltage from one end of a circuit to the other. With 120 volts at a circuit breaker and 0 volts at a light fixture, flipping a switch will cause the 120 volts to flow to the 0 volts.
Try to remove the wallboard cleanly so it can be reattached when you’re done. The baseboard can be reinstalled without replacing the wallboard, but this will create easy access for pest such as rodents, as well as drafts from cold air during the winter.