Demos: 5A-27 Piezoelectricity Effect


A piezoelectric crystal is connected electrically to a neon bulb. A sharp blow from a hammer on the crystal causes the bulb to flash.

Directions: Darken the room as much as possible. Point out carefully the location of the apparatus so that students will know where to expect the flash. Make several blows in succession so that the flashes are more evident.

Suggestions for Presentation: Discuss the concept of piezo electricity. Ask why one has to strike a blow with a hammer. Why not just squeeze the crystal? The ask them to think about the ignition devices on charcoal grills. Why the sudden “snapping” noise when the button is depressed.

Applications: The obvious one is the electronic ignitions for grills, etc.

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Last Updated: May 9, 2016 11:44 AM