overvoltage

over- +‎ voltage

overvoltage (countable and uncountable, plural overvoltages)

1. (physics) The difference between the electric potential of an electrode or cell under the passage of a current and the thermodynamic value of the electrode or cell potential in the absence of electrolysis; overpotential.
2. The hazardous condition that occurs when the voltage in a circuit is raised above that for which it was designed.

overvoltage (third-person singular simple present overvoltages, present participle overvoltaging, simple past and past participle overvoltaged)

1. To raise the voltage of a circuit beyond that for which it was designed.