Ammeters should have low resistance as it is always connected in collection with the circuit. Voltmeter is always connected in parallel with the load. A voltmeter steps the voltage difference in between two different points, but it should not change the quantity of current going through the facet between those two points. So, it must have very high resistance so that it doesn’t allow current to pass with it. If the voltmeter has low resistance, then the present will split and also flow v the voltmeter also, thereby providing incorrect or undesired results across the device. The interior resistance of perfect voltmeter is infinity and also the internal resistance of suitable ammeter is zero.




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