Final answer:
A receptacle is a contact device for connecting an attachment plug to an outlet, like the three-hole outlet that accepts a three-prong plug to ensure correct function.
Step-by-step explanation:
A receptacle is a contact device installed at an outlet for the connection of an attachment plug. In the context of a three-hole outlet, this refers to the standard three-prong plug that fits into the outlet in only one way to ensure the proper function of the three-wire system. The correct answer to the question is: 1) A contact device installed at the outlet for the connection of an attachment plug. This ensures that the electrical devices attached to the wall socket receive the correct electric potential (measured in volts) required for proper functioning. When such devices are used for extended periods, their efficiency might reduce due to wear and in case they cease functioning, replacements or repairs are necessary. The time between necessary replenishments of potential, like recharging batteries or replacing devices, depends on the frequency and intensity of use.