类别电压的英文：
category voltage

Safety use of capacitor must be within the rated voltage(or category voltage)and the permissible current.
电容器安全使用条件不仅受额定电压(或类别电压)的限制,而且受额定电流的限制。

surge voltage protector
浪涌电压保护器

voltage variable brightness diode
随电压变化亮度的二极管

That is how voltage is measured.
那就是如何测量电压的方法。

The triode steps up voltage.
三极管能升高电压。

A momentary voltage dip that lasts for a few seconds or less is classified as a voltage sag.
短时电压跌落持续几秒或更短可归属电压下跌。