Why do electric plugs have holes?

Kategorie: Wissen und Wissenschaft
Kanal: BrainStuff
Datum: 8. August 2014, 18:09
Stufe: B1-B2 (Mittelstufe)


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You might have noticed that plugs for electric appliances have two holes. There are three reasons for these apertures -- find out what they are in this podcast from HowStuffWorks.com.