Why we using 250ohm resistance during lab calibration and why not using in field in one plz define deeply???



Why we using 250ohm resistance during lab calibration and why not using in field in one plz define d..

Answer / vibhash kumar(voith)

Because our maximum electronic components working in the range of 1 to 5 VDC.250 omhs is suitable for the both 1 to 5 V and 4 to 20 MA.through the omhs law.if we will take 4mA it will for 1vdc and 20 mA for 5 vdc( V= IR).we are not using in field because AI 250 mA already contains.so we have no need in field.

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