Energy Transformation: Piezoelectric Crystals in Gas Lighters

[ritwik06]

What sort of energy transformation takes place when a piezoelectric crystal used in a gas lighters gives electric spark when struck?

I think, its mechanical to thermal. What do you say?

 

[JJ420]

mechanical motion enables electric energy to arc and ignite gas
the combustion would be chemical energy released to create thermal energy

 

[ritwik06]

mechanical motion enables electric energy to arc and ignite gas
the combustion would be chemical energy released to create thermal energy

So ultimately the nergy transformation will be from mechanical to thermal. What do you mean by "enables electric energy to arc and ignite gas"??