Simple explanation of Piezoelectric Effect

Replies

• 

  Jeffrey Arulraj

  The tendency of generating charges when a force is applied on a crystal by external agents
• 

  Tarun Goel

  Hey then why we don't adopt this tech. in metroes or railways or anywhere, by putting some crystals so that by the mechanical force of us during walking this produce charge and we can store this in some battery .
  OR we can simply use a MAT formed of crystals.
• 

  Jeffrey Arulraj

  The cost and the power they generate are little below efficient
  
  They are under research and can be implemented in a small scale cause of the price tag they come with
  
  Additional circuitory is needed to amplify the power derived from the crystal these circuits consume almost 100 % of power generated by the crystals
• 

  Jeffrey Arulraj

  Steven Brooks

  Hello Members,
  
  'Piezoelectricity' is the ability of certain crystals to produce a voltage when subjected to mechanical stress. Piezoelectric effect is the property of some materials to convert mechanical energy to electrical current.
  
  
  Thanks and Regards,
  Steven Brooks

  I think you are mistaken pal
  
  The current produced due to piezoelectric effect is called piezoelectricity and the ability of the crystal is called as piezo property and the process involved is called as piezoelectric effect
• 

  Henri

  when pressure is applied on two crystals....a given amount of that pressure causes the generation of a small voltage,,,
• 

  Jeffrey Arulraj

  Henri

  when pressure is applied on two crystals....a given amount of that pressure causes the generation of a small voltage,,,

  I getting a little confused her what do you mean
  
  Do you mean that a little of this pressure is converted into potential
• 

  Henri

  Steven Brooks

  Hello Members,
  
  'Piezoelectricity' is the ability of certain crystals to produce a voltage when subjected to mechanical stress. Piezoelectric effect is the property of some materials to convert mechanical energy to electrical current.
  
  
  Thanks and Regards,
  Steven Brooks

  i think you are wrong...Piezzoelectricity has nothing to do with conversion of mechanical energy to electric current,And it only applies to crystals....plus instead of using the term mechanical stress which is broad..it would be better to say PRESSURE
  
  

  jeffrey samuel

  I think you are mistaken pal
  
  The current produced due to piezoelectric effect is called piezoelectricity and the ability of the crystal is called as piezo property and the process involved is called as piezoelectric effect

• 

  Henri

  it is not the pressure that
  

  jeffrey samuel

  I getting a little confused her what do you mean
  
  Do you mean that a little of this pressure is converted into potential

  is converted into electricity...the pressure causes movement of sub-atomic particles within the crystal structure,,,when a conductor is present...say a wire connected to a bulb from the two crystals....work is done to drive electrons through that conductor....causing somewat a p.d
• 

  Ramani Aswath

  Steven is right.
  Some crystals when subject to a mechanical stress (squeezed) produce a voltage. Conversely if a voltage is applied to these crystals there will be a mechanical distortion.
  The first effect is used in piezoelectric devices like a gas lighter. When you push the plunger a spring releases the push energy in a sudden kick which produces the spark that lights the gas. The same effect is used in many other devices as well.
  
  The reverse effect is used for generating ultrasound. When an ultra sound frequency voltage is applied to the crystal it starts vibrating mechanically at that frequency producing ultra sound.
• 

  Henri

  bioramani

  Steven is right.
  Some crystals when subject to a mechanical stress (squeezed) produce a voltage. Conversely if a voltage is applied to these crystals there will be a mechanical distortion.
  The first effect is used in piezoelectric devices like a gas lighter. When you push the plunger a spring releases the push energy in a sudden kick which produces the spark that lights the gas. The same effect is used in many other devices as well.
  
  The reverse effect is used for generating ultrasound. When an ultra sound frequency voltage is applied to the crystal it starts vibrating mechanically at that frequency producing ultra sound.

  when subjected to stress,,,,well according to Steven..it is that mechanical force that is converted to voltage...i think that is wrong
• 

  Ramani Aswath

  Henri

  when subjected to stress,,,,well according to Steven..it is that mechanical force that is converted to voltage...i think that is wrong

  Nothing wrong in that. When a crystal is distorted the change in the shape of the constituent unit cells changes the charge separation distance, which appears as a change in the surface charge. Conversely if a voltage change is applied to the crystal it deforms mechanically, which is how an ultrasonic transducer works.
• 

  Henri

  bioramani

  Nothing wrong in that. When a crystal is distorted the change in the shape of the constituent unit cells changes the charge separation distance, which appears as a change in the surface charge. Conversely if a voltage change is applied to the crystal it deforms mechanically, which is how an ultrasonic transducer works.

  bioramani...i see what you mean...but don't you think its far-fetched?
• 

  Ramani Aswath

  Henri

  bioramani...i see what you mean...but don't you think its far-fetched?

  I am sure that you have used gas lighters, where you push a lever on top. The lever moves slowly and then there is a sudden jerk with a spark coming between the bottom two electrodes. This is because of this effect.
  
  Gas Lighter
• 

  Henri

  haha....100
  

  bioramani

  I am sure that you have used gas lighters, where you push a lever on top. The lever moves slowly and then there is a sudden jerk with a spark coming between the bottom two electrodes. This is because of this effect.
  
  Gas Lighter

  hahaha...100% agreement with you