Arfa Daily wrote:

Who can tell ? Why "Q" for a transistor ?


'T' was already used for 'Transformer'.


Why "U" for an IC ?


'I' was already used for 'Indicator'.


Why "VDD" ?


Voltage, 'Drain' (for cmos).



Why "VSS" ?


Voltage, 'Source' (for cmos).


I bet if you think for a while, there's loads of these that
don't 'appear' to make any sense, but must have to the o.e.d. I don't think
that there is anything particularly special about fusible resistors in terms
of the materials used to make the resistive element. As far as I know, they
are still carbon or metal film, with a completely non-flammable coating. I
think it is probably the internal connections that are 'necked' or something
to make them deliberately vulnerable to excess current, or heat in the
substrate, generated by excess dissipation.

Arfa


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