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MyASPN >> Mail Archive >> python-Tutor
python-Tutor
Re: [Tutor] Re: complex numbers: j vs. i
by other posts by this author
Aug 26 2002 12:54PM messages near this date
RE: [Tutor] Lost Modules? | [Tutor] Question on tell() function and error produced
Kirk Bailey Wrote:
> CAPITAL 'i' is current.
> 'I'
> I=E/R (ohm's law)
> 'i' is used for indexing. hmmm. and here I have idle open.
> 
> >>>
> >>> i="index"
> >>> I="'current'"

Um, no.  Not true.  In engineering circles (especially electrical
engineering), I/i is always current, regardless of case.  Capital I is
often used when writing equations, but lower case i is also used just as
often, and is probably more frequently seen when diagramming Kirchhoff's
current law.

Since i is sacred, j was substituted for i in complex numbers.  Electrical
engineering calculations favor complex numbers because you can represent
sinusoidal signals as complex numbers and eliminate the need for solving
differential equations.

Blake Garretson


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