In terms of function, what is the role of a voltmeter in an electrochemical cell setup?

The role of a voltmeter in an electrochemical cell setup is to measure the voltage produced by the cell. This voltage indicates the potential difference between the electrodes, which is a direct reflection of the cell's ability to generate electrical energy from the chemical reactions occurring within it.

A voltmeter is specifically designed for this purpose, providing an accurate reading of the electrical potential. This measurement is crucial for understanding the efficiency of the electrochemical processes taking place, as well as for comparing the performance of different cells or configurations.

The other options relate to functions that a voltmeter does not perform. Measuring temperature is typically done by a thermometer, storing electric charge involves components like capacitors or batteries, and assessing the quality of electrodes would require a different kind of evaluation, possibly involving physical inspection or specialized equipment.