Which component is not required to operate an electric horn?

An electric horn primarily operates based on the essential components of a horn switch, a power supply, and typically a relay to facilitate the operation without overwhelming the switch. The horn switch allows the driver to activate the horn, while the power supply provides the necessary electrical current to produce sound. A relay is often included in the system to manage the electrical load efficiently, enabling the horn to function effectively when activated.

The horn computer, however, is not a required component in this operation. Not all electric horn systems utilize a computer; many simply rely on basic electrical principles to function. Therefore, the correct response identifies the horn computer as an unnecessary element for the basic operation of an electric horn. In simpler installations, the absence of a computer does not hinder the basic functionality of the horn.