overvoltage

noun
over·​volt·​age | \ˌō-vər-ˈvōl-tij \

Definition of overvoltage 

1 : the excess potential required for the discharge of an ion at an electrode over and above the equilibrium potential of the electrode

2 : voltage in excess of the normal operating voltage of a device or circuit

First Known Use of overvoltage

1916, in the meaning defined at sense 1

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The first known use of overvoltage was in 1916

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