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In: Electrical Engineering

The real ammeter (with 0 resistance) and voltmeter (with infinity resistance) do not achieve ideal values...

The real ammeter (with 0 resistance) and voltmeter (with infinity resistance) do not achieve ideal values (When using in a lab), but can behave as "effectively ideal" under some conditions. what are those conditions? and what are the approximate value of resistances of the meters that normally use in labs?

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