Charge is at a maximum when the voltage is zero, and voltage is at a maximum when the charge transfer is zero. Open-circuit voltage, Vo, refers to the voltage developed, at the maximum recommended stress level, when charge is prohibited from traveling from one electrode to the other. Short-circuit charge, Qs, refers to the total charge developed, at the maximum recommended stress level, when the charge is completely free to travel from one electrode to the other, and is not asked to build up any voltage. Piezoelectric generators are usually specified in terms of their short-circuit charge and open-circuit voltage.
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