Which of the following describes an electric match incorrectly?

An electric match is a device specifically designed to ignite pyrotechnic materials using an electric current. This is achieved through a small resistive element that generates heat when electricity is applied, which in turn ignites the pyrotechnic material. Answering this question reveals that the option describing the electric match as relying on mechanical pressure is incorrect. Electric matches operate fundamentally on electrical energy rather than mechanical force, which distinguishes them from igniters like squibs that may utilize other forms of activation, such as mechanical triggers or pressure mechanisms.

The other options accurately describe the functions and characteristics of an electric match, such as its ability to ignite pyrotechnics, its common confusion with squibs in terminology, and its requirement for an electric current for operation. Understanding the precise nature of how electric matches work is essential for anyone involved in fireworks and special effects, as this affects safety protocols and operational procedures in various environments.