When measuring voltage with a voltmeter, how should it be connected?

When measuring voltage with a voltmeter, it must be connected in parallel with the component or circuit under test. This connection allows the voltmeter to measure the difference in electric potential between the two points of the circuit accurately without significantly affecting the circuit's operation.

Connecting in parallel ensures that the voltmeter does not alter the current flowing through the circuit, as it presents a very high resistance, allowing minimal current to flow through the meter itself. This is crucial for maintaining the integrity of the measurement and ensuring that the readings reflect the true voltage present across the component being tested.

The other connection methods, such as series or isolation, would not provide an accurate measurement of voltage since they would either disrupt the current flow or not allow for a comparative voltage reading between two points.