Hi, everybody:
Does anyone knows or has experience to measure or calculate the power
consumption of ZnO piezoelectric transducers?

Now, I'm trying to measure it and compare with commercial
electromagnetic dynamic acoustic transducers. But,
strangely, piezo acoustic transducers give more power consumption as follows.
But normally, considering the advantage of piezoelectric acoustic
transducers, shouldn't the power consumption of piezoelectric transducer
bellow than the one that of dynamic transducers?

Is there any misunderstanding in my way to measuring the power
consumption ?


Dc resistance = infinity
AC current = 0.36 mA
AC voltage = 7.1Vrms
Therefore, R= 7.1/0.00036 = 1.97E4 ohm
Therefore, P= square(7.1V)/(1.97E4 ohm) = 2.5 mWatt


Dc resistance = 28 ohm
AC current = 4.4 mA
AC voltage = 0.035Vrms
Therefore, R= 8.03 ohm
Therefore, P = square(0.035V)/(8.03 ohm) = 0.15 mWatt