What describes an intermittent ignition source?

An intermittent ignition source refers to an ignition mechanism that is only active during specific phases of the combustion process, particularly during the initial flame ignition. This means that the ignition source does not remain active throughout the entire combustion event. Instead, it serves its purpose primarily at the beginning to initiate the flame. Once the fire is established, this source is no longer needed for continuous combustion, as the flames can sustain themselves.

This concept is crucial in understanding how certain appliances and systems are designed to operate safely, ensuring that the ignition source is only engaged when necessary. This minimizes the risks associated with constant ignition sources, such as potential backdrafts or uncontrolled flames, which can pose safety hazards.