Piezoelectric Effect of Ceramic Capacitors

[davidsrsb]

As mentioned above you don't even need piezoelectrics- all caps develop forces between the plates.

F=(AEV^2)/(2S^2) Newtons, where A is the area in meters^2, E is 8.85E-12 times the dielectric constant of the material in use, V is the voltage and S is the electrode spacing in meters.

When there is a large ac current flowing, the current flow in the capacitor can be looked at as being in parallel conductors. The forces between these can get quite large.

 

[marce]

Hence the singing caps especially in laptop SMPS supplies.

Slightly off topic but someone was interested in stacked capacitor for a circuit...
Have a look at these:
http://www.avx.com/docs/masterpubs/advprod.pdf

 

[JMFahey]

As mentioned above you don't even need piezoelectrics- all caps develop forces between the plates.

F=(AEV^2)/(2S^2) Newtons, where A is the area in meters^2, E is 8.85E-12 times the dielectric constant of the material in use, V is the voltage and S is the electrode spacing in meters.

How you DARE introduce Physics and Math in a DIY Forum thread ? 😱 😛 😉 😀