When measuring voltage across a component, what configuration should the voltmeter have?

When measuring voltage across a component, the voltmeter should be connected in a parallel configuration. This arrangement allows the voltmeter to measure the potential difference between the two points across the component without significantly affecting the current flowing through the circuit.

In a parallel connection, the voltmeter is placed directly across the component being measured, which ensures that it accurately reflects the voltage drop across that specific component. This method works because voltmeters are designed to have a very high internal resistance, thus minimizing the current that flows through the meter itself, thereby ensuring the measurement reflects the true voltage in the circuit.

Using a series connection would not yield a meaningful voltage measurement, as it would force the voltmeter to take on a significant portion of the current flow and could potentially alter the circuit conditions. Connecting directly to ground can provide a reference point but does not serve the purpose of measuring the voltage drop across a specific component. Therefore, the parallel configuration is the correct choice for this application.