じゅん方向 ほうこう電圧 でんあつではありませんでした
junhōkōden'atsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 順方向電圧

1. Was not forward voltage.; Was not a forward voltage.

Past/Perfective
Negative
Polite
Formal Register