Why is a voltmeter connected in parallel with the circuit element that is a resistor across which voltage is to be measured?

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Solution

Voltmeter:
A voltmeter is a device that measures the difference in electric potential between two points in an electric circuit.
Since the voltmeter must draw zero current to measure the voltage across a load in a circuit, it has a high resistance value and is linked in parallel to achieve this.
Voltmeter internal resistance is quite high (ideally it is infinite). If they are connected in series, they will totally obstruct the circuit's ability to conduct electricity, preventing the circuit from being finished.
Moreover, If the voltmeter is connected in parallel to the electrical equipment, the voltage across the parallel combinations remains constant, making it easy to measure the voltage.

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