Basic Electrical Theory
METRIC SYSTEM AND POWERS OF TEN
APPENDIX A
METRIC SYSTEM AND POWERS OF TEN
Metric System
Units of the international metric system, commonly called SI (system internationale), are used
in electricity. The seven basic units are shown on Table A-1. Two supplementary units of SI
are shown on Table A-2.
TABLE A-1
BASE UNITS of the
INTERNATIONAL METRIC SYSTEM
Quantity
Base Unit
Symbol
Length
meter
m
Mass
kilogram
Kg
Time
second
s
Electric current
ampere
A
Thermodynamic temperature
Kelvin
K
Light intensity
Candela
cd
Amount of substance
mole
mol
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