Piezoelectrics
Piezoelectrics • Big word – piezein is greek for “squeeze” • Some crystals, when squeezed, make a spark • Turns out the process goes the other way too • Spark a quartz crystal, and it flexes • Piezo buzzers use this to make sound (flex something back and forth, it moves air) Piezo buzzers don’t have quartz crystals, but instead a kind of ceramic that also exhibits
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