Can a piezoelectric generator create heat? If so, how is it done?

I have a science project to do at school and I need some serious help! Ive been trying to figure out whether a piezoelectric generator can be used to

I have a science project to do at school and I need some serious help! I've been trying to figure out whether a piezoelectric generator can be used to create heat and Google just ends up taking me to links that discuss harvesting heat to create electricity... HELP PLEASE!!!

or:I have a science project to do at school and I need some serious help! I've been trying to figure out whether a piezoelectric generator can be used to create heat and Google just ends up taking me to links that discuss harvesting heat to create electricity... HELP PLEASE!!!

or:Piezoelectric refers to a crystal that generates a voltage when it is deformed. That's all it means. It can be used to light a gas fire or to generate a precise time reference, but there is not enough power to heat anything.

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