Piezo ignition

[1] Piezo ignition uses the principle of piezoelectricity, which is the electric charge that accumulates in some materials in response to mechanical deformation.

This sudden forceful deformation produces a high voltage and subsequent electrical discharge, which ignites the gas.

Piezo ignition systems can be operated by either a lever, push-button or built into the control knob.

However, this takes a long time — piezoelectric igniters usually stop sparking after several tens of thousands of strikes.

The most common material used in piezo ignition systems is lead zirconate titanate (PZT).