じゅん方向 ほうこう電圧 でんあつ降下 こうかじゃなかったです
junhōkōden'atsukōkajanakattadesu

Noun
Desu Copula

The polite, past negative form of 順方向電圧降下

1. Wasn't a forward voltage drop.

Past/Perfective
Negative
Polite
Casual Register