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why do ohm meters need batteries while volt meters and ameters don't?
why do ohm meters need batteries while volt meters and ameters don't?
An Ohm meter needs batteries because it applies a known voltage derived from the battery across the resistance being measured. For a given applied voltage, the current drawn by the unknown resistance is measured by the meter and determines the value of the resistance (R = V/I). A voltmeter or ammeter obtain the voltage or current needed for measurement directly from the source being measured.
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