- #1
PFuser1232
- 479
- 20
I have once read that if a voltmeter is connected across an open switch in a circuit, the emf of the source is shown on the voltmeter, because this connection completes the loop, making a tiny current flow through the circuit, and since the voltmeter has a huge resistance, the entire voltage drop is due to the voltmeter. But won't connecting a voltmeter across a switch also form a series circuit? And, according to my knowledge, voltmeters show no reading when connected in series.