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The ammeter is used in series, because you want to measure the current through a circuit. The voltmeter is used in parallel, because you want to measure the voltage across a circuit.

If you were to place the voltmeter in series, no current would flow because of the relatively high impedance of the voltmeter.

If you were to place the ammeter in parallel, you would create a short-circuit, due to the relatively low impedance of the ammeter.

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15y ago

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