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?
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[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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