To measure the potential difference across resistor r2, the voltmeter is connected in parallel with the resistor.
A voltmeter is an electrical instrument device that is used to measure the potential device or voltage between two points in an electric circuit. A voltmeter can also measure the potential difference across circuit element.
To measure the potential difference across resistor r2, the voltmeter is connected in parallel with the resistor. That is both terminals of the voltmeter are connected to the terminals of the resistor.
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