Also you need to know the Units in Electronics

The unit (and unit symbol) which is used to measure each quantity. For example: Charge is measured in coulombs and the symbol for a coulomb is C.

Some of the units have a convenient size for electronics, but most are either too large or too small to be used directly so they are used with the prefixes shown in the second table. The prefixes make the unit larger or smaller by the value shown.

Some examples:
25 mA = 25 × 10-3× 0.001 A = 0.025 A
47µF = 47 × 10-6× 0.000 001 F = 0.000 047 F
270kΩ = 270 × 103 Ω= 270 × 1000 Ω= 270 000 Ω F = 47 A = 25

PrefixPrefix SymbolValue
millim10-3=0.001
microµ10-6=0.000 001
nanon10-9=0.000 000 001
picop10-12=0.000 000 000 001
kilok103=1000
megaM106=1000 000
gigaG109=1000 000 000
teraT1012=1000 000 000 000

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