Voltmeter
A voltmeter is an instrument used to measure electrical difference between two points in an electric circuit. Voltmeters have an accuracy of a few per cent of the full scale.The voltmeter has two wires to measure voltage.
The first digital voltmeter was invented and produced by Andrew Kay in 1954. The numbers mean
| 1K | 1000 |
| 1M | 10000 |
| 1G | 100000 |





