Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!dsinc!netnews.upenn.edu!eniac.seas.upenn.edu!depolo From: depolo@eniac.seas.upenn.edu (Jeff DePolo) Newsgroups: sci.electronics Subject: Re: Why sqrt(-1)=j and not sqrt(-1)=i Message-ID: <42366@netnews.upenn.edu> Date: 1 May 91 14:58:27 GMT References: <1139@helps.cactus.org> Sender: news@netnews.upenn.edu Reply-To: depolo@eniac.seas.upenn.edu (Jeff DePolo) Organization: University of Pennsylvania Lines: 13 Nntp-Posting-Host: eniac.seas.upenn.edu In article <1139@helps.cactus.org> jhoward@helps.cactus.org (James Howard) writes: >In math the sqrt(-1) is representated by the letter i. In electronics >why is the letter j used to represent the square root of -1? The way I heard it, it's to keep EE's from confusing it with current (I). --- Jeff -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Jeff DePolo N3HBZ/AE Twisted Pair: (215) 386-7199 depolo@eniac.seas.upenn.edu RF: 146.685- 442.70+ 144.455s (Philadelphia) University of Pennsylvania Carrier Pigeon: 420 S. 42nd St. Phila PA 19104