じゅん方向 ほうこう電圧 でんあつじゃなかったです
junhōkōden'atsujanakattadesu

Noun
Desu Copula

The polite, past negative form of 順方向電圧

1. Wasn't forward voltage.; Wasn't a forward voltage.

Past/Perfective
Negative
Polite
Casual Register