- #1
markuz
- 5
- 0
Hello everyone, I am running a physics class next week where I want to show to high school children the power of piezoelectricity.
I want to let them see with their own eyes that if a crystal is squeezed the differential potential between two opposite faces will change accordingly to the amount of deformation (load) the crystal undergoes. So I took off a bit of crystal from a gas lighter, connected to electrodes to opposite faces to measure the voltage with a multimeter.
What I found out doing the experiment is that the crystal do get charged as soon as the load is applied, but the voltage is rapidly decreasing (obviously because all the charge travel across the circuit to produce the reading); sometime it is so fast that I cannot get the reading at all. Anybody knows a better way to get such voltage gauge in such short amount of time (b.t.w. I am using both an analogue voltmeter and a multimeter to get the readings)?
Any suggestion appreciated.
Thanks
I want to let them see with their own eyes that if a crystal is squeezed the differential potential between two opposite faces will change accordingly to the amount of deformation (load) the crystal undergoes. So I took off a bit of crystal from a gas lighter, connected to electrodes to opposite faces to measure the voltage with a multimeter.
What I found out doing the experiment is that the crystal do get charged as soon as the load is applied, but the voltage is rapidly decreasing (obviously because all the charge travel across the circuit to produce the reading); sometime it is so fast that I cannot get the reading at all. Anybody knows a better way to get such voltage gauge in such short amount of time (b.t.w. I am using both an analogue voltmeter and a multimeter to get the readings)?
Any suggestion appreciated.
Thanks