Voltmeter in series?

TL;DR

This paper examines the unconventional idea of connecting a voltmeter in series within a circuit, exploring its implications for physics understanding, educational practices, and the potential for fostering creativity versus adherence to standard rules.

Contribution

It critically analyzes the concept of using voltmeters in series, discussing its theoretical validity, educational impact, and potential to challenge or reinforce traditional circuit analysis methods.

Findings

Series-connected voltmeter can approximate resistor behavior under certain conditions

Using voltmeters in series may influence physics teaching and conceptual understanding

The approach raises questions about proper circuit analysis and educational practices

Abstract

A recent physics challenge shows a circuit, where a voltmeter is connected in series. Indeed, real voltmeters have finite input resistance, therefore one may think that they can be used as resistors. In addition, voltmeters measure the voltage difference between their terminals, therefore it seems to be possible to calculate the current flowing through them. Is it okay? Does it make the voltmeter more universal? Are there any hidden secrets? How it is related to high-quality physics and STEM education, which are increasingly important in the modern world? Doesn't it approve an improper use that one can never see in any textbook and application? Suggesting and teaching such uncommon solutions doesn't generate undesired attitude? On the other hand, can it make the development of creativity and understanding harder if the students are taught to follow always the application rules? We do think it bears some discussion.