The seven SI base units | Symbol | Name | Quantity |
| s | second | time |
| m | metre | length |
| kg | kilogram | mass |
| A | ampere | electric current |
| K | kelvin | temperature |
| mol | mole | amount of substance |
| cd | candela | luminous intensity |
Commonly encountered units of measure in electronics are derived from SI units.
Table of the most commonly used SI units.
| Prefix
|
Base 10
|
Decimal
|
English word
|
| Name
|
Symbol
|
| giga
|
G
|
1 x 109
|
1,000,000,000
|
billion
|
| mega
|
M
|
1 x 106
|
1,000,000
|
million
|
| kilo
|
k
|
1 x 103
|
1,000
|
thousand
|
| hecto
|
h
|
1 x 102
|
100
|
hundred
|
| deca
|
da
|
1 x 101
|
10
|
ten
|
|
|
1 x 100
|
1
|
one
|
| deci
|
d
|
1 x 10-1
|
0.1
|
tenth
|
| centi
|
c
|
1 x 10-2
|
0.01
|
hundredth
|
| milli
|
m
|
1 x 10-3
|
0.001
|
thousandth
|
| micro
|
µ
|
1 x 10-6
|
0.000 001
|
millionth
|
| nano
|
n
|
1 x 10-9
|
0.000 000 001
|
billionth
|
| pico
|
p
|
1 x 10-12
|
0.000 000 000 001
|
trillionth
|
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