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 GCSE     Basics     Atom     BCD     Binary     Conductors     Current     Energy     Equations     Insulators     Maths     Power     Resistance     Safety     >SI Units<     Superconductors     Symbols     Transfer Characteristics     Voltage

# Basics SI Units

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GCSE    Basic Electronics    Questions 0 to 35   -->  View All

Always use whole Volts, Amps, Ohms, Watts, Farads, Etc in your calculations.

 Name Prefix Factor Factor yocto y 10-24 zepto z 10-21 atto a 10-18 femto f 10-15 pico p 10-12 /1000000000000 nano n 10-9 /1000000000 micro µ 10-6 /1000000 milli m 10-3 /1000 centi c 10-2 /100 deci d 10-1 /10 deca da 101 x10 hecto h 102 x100 kilo k 103 x1000 mega M 106 x1000000 giga G 109 x1000000000 tera T 1012 x1000000000000 peta P 1015 exa E 1018 zetta Z 1021 yotta Y 1024

## Notes

• The yellow highlights are commonly used in Electronics and Computing.
The others are more exotic and/or extreme!

## Examples

When plugging values into formulas ...

• always use whole Volts, Amps, Farads, Watts, Hertz etc.

## Conversions Between Units

47 pF = 47 x 10-12 F

10 nF = 10 x 10-9 F

100 µF = 100 x 10-6 F

22 kΩ = 22 x 103 Ω

1.5 MΩ = 1.5 x 106 Ω

35 mW = 35 x 10-3 W

32 kHz = 32 x 103 = 32000 Hz

771000 kHz = 711 MHz

## Common Mistakes

• Don't write MV when you mean mV.
The first is megavolts and the second is millivolts.
Only a 1000000000 times error!
• If you have 1000 Ohms, that is one kilohm and not
one killer-ohm unless you really do mean ohmicide!
• Also say one megohm and not one mega-ohm.
• Note the lower case k for Kilo. Using an upper case K is a common mistake.

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