The device used for measuring potential difference is always connected in [[1]].

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Detailed Solution

The device used for measuring potential difference is always connected in Parallel.
A voltmeter is connected in parallel with a circuit element to measure the voltage drop across it. It must be designed to draw minimal current from the circuit so that it does not significantly change the circuit during measurement-different ratings of the Voltmeter. For example, mV is the Voltmeter used to measure very low voltage in the circuit.

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