Which of the following is NOT a basic component of a switch or receptacle?

In the context of electrical switches and receptacles, a basic component refers to the fundamental parts that make the device function. A terminal is an essential part of a switch or receptacle that allows electrical connections to be made. Contact points are also critical as they are the areas where electrical connections occur when the switch is in the 'on' position, completing the circuit.

A cover plate serves as a protective and aesthetic element that covers the mounting hardware and wiring behind the switch or receptacle. While a cover plate is important for safety and appearance, it does not contribute to the functional operation of the switch or receptacle itself.

The lock spring, on the other hand, is not a standard component found in basic switches or receptacles. While some specific types of devices may include springs for various functions, most basic switches and receptacles do not require a lock spring for their operation. Instead, the main focus of such devices is on the effective connection and disconnection of electrical circuits through terminals and contact points, making the lock spring an unnecessary element in the context of essential components.