24V DC control voltages,grounded (earthed) and ground free.

分类: 作业答案 • 2021-12-31 14:12:49

问题描述：

24V DC control voltages,grounded (earthed) and ground free.
grounded (earthed)是不是指24V-
ground free指24V+

答

grounded是接地吧
窃以为,接地的话不是电势为0了吗?