Ed's Radio (AA6ED) – Metric Prefixes

Metric Prefixes

Often in electronics, you will need to use units that are much larger or smaller than the standard volt, ampere, or ohm. To do so, you can attach a metric prefix before the unit. The following table shows many of the standard prefixes used.

Prefix Symbol Decimal Multiplier
yotta Y 1×1024
zetta Z 1×1021
exa E 1×1018
peta P 1×1015
tera T 1×1012
giga G 1×109
mega M 1×106
kilo k 1×103
hecto h 1×102
deca da 1×101
deci d 1×10-1
centi c 1×10-2
milli m 1×10-3
micro μ 1×10-6
nano n 1×10-9
pico p 1×10-12
femto f 1×10-15
atto a 1×10-18
zepto z 1×10-21
yocto y 1×10-24

As examples: 0.004 amperes can be written as 4 mA (milliamperes) and 6.2 MΩ (MegaOhms) is the same as 6,200,000 Ω

Next: Kirchoff's Law