This effect is known as the piezoelectric effect.
if the varying potential applies to a piezoelectric transducer, it will change the dimension of the material or deform it. The EMF develops because of the displacement of the charges. The material has the capability of working at low voltages, and also it can operate at the temperature more than 3000✬ Piezoelectric Effect It is available in different shapes and sizes. The ceramic material has several advantages. The property is developed on it by special polarizing treatment. The ceramic material does not have the piezoelectric property. The ceramic material is also used for piezoelectric transducer. The Quartz is the examples of the natural piezoelectric crystals, whereas the Rochelle salts, ammonium dehydration, phosphate, lithium sulphate, dipotassium tartrate are the examples of the man made crystals. The word piezoelectric means the electricity produces by the pressure. The material which shows such property is known as the electro-resistive element. the material induces voltage when the pressure or stress applied to it. The piezoelectric transducer uses the piezoelectric material which has a special property, i.e. The piezo transducer converts the physical quantity into an electrical voltage which is easily measured by analogue and digital meter.