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Re: CHAT: Need a word for these!

From:Christophe Grandsire <christophe.grandsire@...>
Date:Thursday, January 31, 2002, 7:59
En réponse à Danny Wier <dawier@...>:

> > E and V mean the same thing, potential difference (or voltage).
Not exactly, at least to me and other scientists in France. We use U (or sometimes V) for a potential difference (a scalar, i.e. a value), V for the potential itself (also a scalar), while E is used only for the electromotive (or simply electric) field, which is a vector (an "arrow"), kind of a generalisation of U for 3-dimension problems. It's E which is used in Maxwell's Laws, the basic laws of electric and magnetic behaviour.
> > But where exactly do the letters E and Z themselves come from? >
E from "electric" in "Electric field". R is for resistance, while Z is for impedance (which is a generalisation of resistance to be used with periodic currents, and elements like condensators, which have an impedance but no resistance). It's written Z because it's a complex number (a number using the square root of -1 :)) ), and z is the normal label for complex numbers (like x is for real numbers and n for integers). The main difference between resistance and impedance is that impedance depends on the frequency of the current (allowing to talk about low-pass, band-pass or high-pass systems) and doesn't only damp or enhance a voltage but also dephases it. Of course, the impedance of a circuit made only of resistors is equal to its resistance, but real circuits always have condensators and/or inductors (even if those are only parasitic), and that's what makes impedance interesting :))) . He he, all that reminds me of my studies :)) . I've had quite a lot of classes on electricity and electronics :)) .
> > The sound [Lt] with L meaning a voiceless lateral fricative is a neat > one, which > makes me think of American Indian languages of the Western US and > Canada. It's a > possible sequence in Tech as well, being the analogue to Hebrew s' + t; > s' is > sin instead of shin. I hope I actually get to use it. >
I still have to make a language with a voiceless lateral fricative :)) . Maybe my Arabo-Romance will get one :)) . Christophe. Take your life as a movie: do not let anybody else play the leading role.