- Messages
- 1,665
- Reaction score
- 2,400
- Points
- 273
Suppose you're measuring a potential difference of 4V. You start with a voltmeter that can read up to 20v. The needle only moves a little since the magnitude is small compared to the range of the voltmeter. Then you use a 5V voltmeter to measure the same pd, so that the needle almost fully moves to the right. The smaller range gives a more accurate reading.
thn y not start with low range voltmeter at the first....