>"So by applying an alternating voltage, you can make the transducer vibrate with rather considerable force. These vibrations can be slow—the kind needed for ha

>"So by applying an alternating voltage, you can make the transducer vibrate with rather considerable force. These vibrations can be slow—the kind needed for haptic feedback—or very fast, to the highest audio frequencies and beyond. While creating the effect with ceramic material requires relatively high voltages—in the range of 40 volts or more—it requires very little current and, hence, little power—far less than the power used by mobile device speakers today." I'm not too concerned about the high(er) voltage (than say 5V or 12V) requirement -- but the fact that this, well, let's call it "momentum in an oscillatory/vibratory (AKA trapped) mode" or, perhaps more broadly, "energy" -- requires very little current (AKA "power", AKA "energy") -- should be of interest! In other words, what devices could be conceived of, for this effect, in the future? Also, is there a potential connection here (if so, I don't see it yet! <g>) with warping space (AKA a future "warp field", if one could ever be created in the future) -- and "warping" (if ever so slightly -- on the microscopic scale) the dimensions of a piece of piezoelectric glass -- with a voltage? Well, probably not! (But then again... maybe! <g>) Anyway, a very interesting article!