Direct Current Circuits
Fundamental electrical principles
2.8.1.2
1

Fundamental units
* 7 Base Units
*International Metric System-
Systeme Internationale (SI)
2

Fundamental SI units
Amount of Substance Mole mol
3

ANDRE AMPERE
 ELECTRO -
MAGNET
 1775-1836
4

SI Derived units
★ Basic Units are not sufficient for all situations
of measurement
★Derived units are for non-basic situations
★Derived Units use: length, mass and time
(various combinations)
★Derived Unit Groups: Mechanical, electrical,
magnetic
5

Derived Mechanical
Units
6