should the resistance of an ammeter be low or high
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The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured. In fact, an ideal ammeter is one which has zero resistance.
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An ammeter is inserted in series with a circuit to measure the amount of current flowing. Its resistance must be low so as to not disturb the circuit. The lower the resistance, the less effect the ammeter has on the circuit.
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