Application of Piezoelectricity:
There are all kinds of situations where we need to convert mechanical energy into electrical energy and vice versa. Most often we can do that by using piezoelectric transducers. As we know transducer is a simple device that converters a small amount of energy from one form to another. For example, a crystal microphone is a kind of piezoelectric transducer that converts sound energy into electrical form.
In ultrasound equipment, a piezoelectric transducer converts electrical energy into extremely rapid mechanical vibrations – so fast, that it makes sounds. This sound signal frequency is too high that is beyond the audible range (20Hz to 20kHz). The ultrasound signal can be used for scanning as well as cleaning various mechanical machine parts.
The reverse-piezoelectric is used in a quartz clock or watches to keep time very precisely. Electrical energy from a battery is fed across a piezoelectric crystal to make it oscillate thousands of times within a second. The watch then uses an electronic circuit to turn that into slower, once-per-second beats that a tiny motor and some mechanical gears to drive second, minute, and hour hands around the clock-face.
The piezoelectricity is being used in gas lighters also. Press the gas lighter switch and you will hear a clicking sound and see the spark. Why it happens, when you press the gas lighter switch, is squeezing a piezoelectric crystal, generating a voltage, and making a spark fly across the small gap.
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