The transducer amplitude is directly affected by the load. Therefore, care must be taken not to run the transducer without a load, as the amplitude will be very high and fatigue may occur. (This assumes that the power supply does not have feedback circuitry that controls the amplitude.) Appreciable amplitude can be obtained with relatively low voltage. Contrast with parallel resonance.
Series resonance will occur somewhat below parallel resonance.
Also called "short circuit resonance" because of the low impedance and because, if the piezoelectric ceramics are shorted together, this is the resulting mechanical resonance of the transducer.
Also simply called "resonance" but this term should generally be avoided so as not to cause confusion with the general term resonance.