overpotential; over-voltage
This word is a known misprint for 過電圧 (かでんあつ). The correct term is 過電圧, which means overvoltage or overpotential. This form should not be used.
「加電圧」 is a misprint for 「過電圧」; the correct spelling is 過電圧.
This is a misprint for 過電圧 (かでんあつ). The kanji 加 (add) was mistakenly used instead of 過 (exceed).