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Why 4ma-20ma ?

Engineering
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I suspect the question is in relation to measuring devices and transmission within and control system. Basically you can't use zero because you can't detect a malfunction transmission. The standard industry is 4 - 20mA and 1-4 V. A system using these ranges in transmission of temperature, pressure and other system measurements which are relied to control panels and controllers.
Ideally a output of an electric/electronic circuit can be simulated with a series Thevenin voltage/impedance or it's corollary a parallel Norton/impeadance. The impedances are the same and IN = VTH/impedance. Personally if one is valid so should the other, though I remember some saying the contrary.

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