Production of electricity by pressure, Physics

Production of electricity by pressure:

Certain crystals and semiconductors produce an emf between two opposite faces when the mechanical pressure on them is either increased or decreased (the polarity of the emf is reversed when the pressure changes from an increase to a decrease).  This emf is known as the piezoelectric emf.

This effect is used in a number of devices including semi-conductor strain gauges and vibration sensors.  As the mechanical pressure on the crystal is altered, a varying voltage which is related to the pressure is produced by the crystal.  The voltage can be as small as a fraction of a volt or as large as several thousand volts depending on the crystal material and the pressure. Aircraft systems employing the piezoelectric effect generally only produce very small emf's, the very high voltages produced by materials such as lead zirconate titanate are used in ignition systems for gas ovens and gas fires.

 

 

Posted Date: 9/13/2012 1:42:19 AM | Location : United States







Related Discussions:- Production of electricity by pressure, Assignment Help, Ask Question on Production of electricity by pressure, Get Answer, Expert's Help, Production of electricity by pressure Discussions

Write discussion on Production of electricity by pressure
Your posts are moderated
Related Questions
Why we are showing work done over a closed path is zero to prove that electrostatic forces are conservative

Define Baron von Münchausen and Intergalactic Travel? Recently get archives of the late Baron von Münchausen brought to light some unpublished scientific papers. In one of them

pascal; Pa The derived SI unit of pressure explained as 1 N working over an area of 1 m 2 ; thus it has units of N/m 2

please tell me some topics of biophysics.

What does it mean when a coulomb of charge has a certain number of joules?


Find the speed of the wave A copper wire, whose cross-sectional area is 1.1 x 10 -6  m 2 has a linear density of 7.0 x 10 -3 kg/m and is sturng between two walls. At the ambient


In a pool game a .17kg cue ball traveling at .75 m/s in the plus x direction hits a stationary eight ball. The eight ball moves off with velocity of .25 m/s at an angle of 37 degre

What is packing polymorphism When polymorphism exists as a result of change in crystal packing, it is called packing polymorphism. Polymorphism can also result from the existen