Piezoelectric Energy
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FIGURE 36-18
Piezoelectric energy.

When crystals of certain materials, such as quartz, are subjected to mechanical stress, an electrical potential is produced across the crystals Figure 36-18. The process is also reversible. A potential electrical difference across the crystal will physically distort the crystal. The best-known simple application of piezoelectric energy is the sparking lighters that ignite gas in grills, barbecues, or cooktops, but the piezoelectric principle is also used in automobiles in knock sensors and pressure sensors and in some electronic fuel injectors.