What is the purpose of an attachment plug?

The purpose of an attachment plug is to establish a connection with receptacle conductors. This device allows for the easy and safe connection of electrical devices to a power source via an outlet. When an attachment plug is inserted into a receptacle, it completes an electrical circuit, providing the necessary power for devices such as lamps, appliances, and tools to operate.

Attachment plugs are designed to provide a secure and reliable connection while also allowing for easy disconnection when the device is not in use. This functionality supports both convenience and safety by enabling users to connect and disconnect equipment without needing to manipulate wires directly, reducing the risk of electrical shock or short circuits.

The other choices focus on functionalities that do not accurately describe the primary role of an attachment plug. For instance, while insulation is crucial for safety in electrical systems, the attachment plug itself does not primarily serve to insulate connections. Additionally, the permanency of connections and circuit establishment mentioned in another option wouldn't apply to attachments, as they are intended for temporary connections. Lastly, converting a standard outlet to a multi-outlet is outside the scope of an attachment plug's purpose, which is specifically about connecting devices to existing receptacles.