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What is EMI, EMC and EMS? 

       There are many initials in the field of electrical interference. EMI (Electro Magnetic Interference) literal translation is electromagnetic interference. 

  This is a compound word, we should consider "em" and "noise". The so-called "interference" refers to interference of device performance reduced the interference source and interference equipment these two meanings. First layer of meaning such as lightning radio noise, motorcycles in nearby TV screen appears after the snow, picked up the phone and hear the radio voices, these can be referred to as "BC I" "TV I" "Tel I", these abbreviations are in the same "I" (interference) (BC: broadcast)