SI (System Internationale) Metric System:
An Electrical unit of measurement is based on the International (metric) System that is also known as the SI System. A Unit of electrical measurement involves the following:
- Ampere
- Volt
- Ohm
- Siemens
- Watt
- Henry
- Farad
Appendix A gives more information concerning the metric system, metric prefixes, and powers of 10 which are used in electrical measuring units.