When measuring the voltage across a circuit component, what does the voltmeter appear to be in the circuit?

A voltmeter must be connected in parallel across the component whose voltage you are measuring. To prevent the meter from altering the circuit's normal behavior or drawing away the current intended for the component, the meter is designed to have a very high internal resistance. If the voltmeter had a low resistance, it would create a parallel path of least resistance, drawing significant current away from the actual circuit. This would artificially lower the voltage across the component, resulting in an inaccurate measurement and potentially damaging the circuit under test.