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Should the resistance of an ammeter be low or high? Give reason. 

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In order to measure the current through an element in a circuit, an ammeter is connected in series. In order to have the most accurate reading the resistor of the ammeter should be as low as possible so that it won’t tamper the current in the circuit.

If resistance is high, then some amount of current may be lost in heating it, leading to the inaccurate reading. An ideal ammeter is one which has zero resistance.

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