大家有聽過熱地Hot ground嗎? 這是一個在電源供應器會看到的名詞，今天就來講一下冷地與熱地有甚麼不一樣。
Photo credit:
Power supply
By Victor Korniyenko
License : CC/to share/to remix/attribution/share alike
https://commons.wikimedia.org/wiki/File:Power_Supply_ATX-450PNF.jpg
Ground Rod
by Ali K
License : CC/to share/to remix/attribution/share alike
https://commons.wikimedia.org/wiki/File:HomeEarthRodAustralia1.jpg