Dave's ESL Cafe's Student Discussion Forums

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SI units are internetional unit system, which are unit all the units around the world, makes people to rememeber and caculator more easily. I modlen day in some countries are more likely to use yard, pound and feet for their main unit. They are less communicated, so before study science you have to able to read SI unit
Here is some examples
Physical quantity Symbol Unit symbol
Time t Second, minute, hour s, min, h
Frequency f hertz Hz
Current I ampere A
voltage V volt V
Resistance R ohm 
Power P watt W
Inductance L henry H
Capacitance C Farad F
Energy E joule J
Amount of substances
n mole mol

Electric charge Q Coulomb C
Length l Metre, centimetre m, cm
Area A square m^2, cm^2
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