Three point flexural test

2013-12-11T06:27:45Z

103.26.47.241: /* Testing method */

In [[engineering]], '''double-subscript notation''' is notation used to indicate some variable ''between'' two points (each point being represented by one of the subscripts). In [[electronics]], the notation is usually used to indicate the direction of current or voltage, while in [[mechanical engineering]] it is sometimes used to describe the [[force]] or [[Stress (physics)|stress]] between two points, and sometimes even a component that spans between two points (like a beam on a bridge or [[truss]]). Note that, although there are many cases where multiple subscripts are used, they are not necessarily called ''double subscript notation'' specifically.<ref>{{citation|title=Circuit Analysis for Power Engineering Handbook |author=Moses E. Zarudi, Shenkman, Arieh L. Shenkman|year=1998|publisher=Springer|isbn=0-412-83180-5}}</ref>

This is a [[Convention (norm)|convention]] to standardize the directions of double-subscript labels. The following uses [[transistors]] as an example, but shows how the direction is read generally. The convention works like this:

<math>V_\mathrm{CB} \ </math> means the "V" from C to B. In this case, V would probably stand for voltage, C would probably denote the collector end of a transistor, and B would denote the base end of the same transistor. This is the same as saying "the voltage drop from C to B". Although this assumes what the letters are, presumably this notation can be used in other contexts.

<math>I_\mathrm{CE} \ </math> means the "I" from C to E. In this case, I would probably stand for current, C would again probably denote the collector end of a transistor, and E would denote the emitter end of the transistor. This is the same as saying "the current in the direction going from C to E". Although this assumes what the letters mean, presumably this notation can be used in other contexts.

The names given to [[IC power supply pin|power supply pins on integrated circuits]] are independent from the conventions used in double subscript notations. They are coincidentally named in a similar way, for example V<sub>CC</sub>.

==References==
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[[Category:Notation]]
[[Category:Engineering]]

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Three point flexural test