# Piezoeletric voltage generation calculation

## Main Question or Discussion Point

Hey,

I was wondering if someone could post or create/explain a simple piezoeletric problem in which a stress acts on a piezo material and creates a voltage.

I want to be able to understand how to caculate the voltage generated and current created.

Thanks for any help

Related Materials and Chemical Engineering News on Phys.org
Try here, under applications.

Thanks Timmay!

Ok real quick so I followed throught it and understand

But when the start working the problem they say

d33= 25 pC/N

but when the work the problem the use 10.10^-10 for their e value to C???
shouldnt that e be 25pC/N????

The first expression calculates the capacitance C of the sensor. Epsilon is the electrical permittivity of the material, A is the area, t thickness. C'' is the capacitance per unit area.

$$C^{''} = \frac {\epsilon} {t}$$

$$C = \frac {\epsilon A} {t}$$

$$C = 10E^{-10}\times\frac {1E^{-2}*1E^{-2}} {100E^{-6}}$$

$$C = 100 pF$$

To calculate the charge generated under a load of 10 N:

$$Q = 25 pC/N \times 10 N = 250 pC$$

Knowing the relationship between voltage, charge and capacitance:

$$V = \frac {Q} {C}$$

$$V = \frac {250 pC} {100 pF}$$

$$V = 2.5 V$$

Make a bit more sense?

Last edited:
Where exactly did you find these calculations. Im currently in a research team in highschool working on developing piezoelectric nanofibers.