How is current direction measured using a voltmeter?

Measuring current direction with a voltmeter can be effectively achieved using one reference electrode at each measurement point. This approach allows for a clear and precise determination of the voltage difference between two points in a circuit, which indirectly helps to ascertain the direction of current flow. By measuring voltages with a single reference electrode in a manner that assesses the potential at various points in the circuit, one can infer the behavior of current concerning those points.

Using one reference electrode simplifies the measurement and analysis process; it provides a baseline that is crucial for determining the direction and magnitude of current flow in electrochemical systems. This method is commonly used in practices related to corrosion prevention, where understanding current direction is important for evaluating cathodic protection systems and other electrochemical reactions.

The other approaches either complicate the measurement process or do not adequately facilitate the determination of current direction as clearly as using one reference electrode does.