As an example Apple could include a grid of piezoelectronic actuators in future versions of the iPhone that can be activated on command. By fluctuating the frequency of these actuators, the user will "feel" different surfaces as their finger moves across it. As an example, a display could include a virtual click wheel which vibrates at a different frequency as the center. Users could easily sense the difference and use the click wheel without having to look at it.
According to Wikipedia, "Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress."
ceramic that produces voltage when stressed.
It is a an electrical pie. fact.
Crystals.
CRYSTALS
Pierre Curie discovered piezoelectricty.
Crystals
Greek
4-10 dollars
Examples: tourmaline, quartz, Rochelle salt, topaz etc.
piezoelectricity
consider a triangle where each corner represents kinetic, electrical n thermal. the side bw thermal and electrical rep the pyroelectricity and it produces no kinetic The side bw thermal and kinetic rep the piezoelectricity and it produces no heat
when crystals such as quartz and Rochelle salts are squeezed or pressed ,they release electrons.This effect is known as piezoelectricity.
You are talking about piezoelectricity. See related linksbelow.
When piezoelectricity material is squeezed, it produces electricity. This is the esseantial idea about piezo materials.