Which one of the following options is not classified as a device?

A light fixture is considered part of the lighting system rather than a device in the same sense as the others listed. In electrical terminology, a 'device' typically refers to equipment that performs a specific function or serves a particular purpose in electrical systems.

Switches, outlets, and transformers each serve specific roles: switches control the flow of electricity, outlets provide a point of connection for electrical devices, and transformers alter voltage levels in a system.

In contrast, a light fixture is generally seen as a component that houses and supports lighting elements, such as bulbs, rather than functioning as an independent device. This distinction is crucial for understanding circuits and electrical configurations. Recognizing the definitions and classifications of electrical components helps in effectively working with electrical systems and ensuring compliance with standards.