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International System of Units
The International System of Units (SI), adopted by the General Conference on Weights and Measures in 1960. There are six (5) principal units from which the units of
all other physical quantities can be derived. Table 1 below shows the six units, their symbols, and the physical quantities they represent. The SI units are used are used by professionals irrespective of their geographical location.
One great advantage of the SI unit is that it uses prefixes based on the power of 10 to relate larger and smaller units to the basic unit. Table 2 shows the SI prefixes and their symbols.
Example:
1,000,000 mm = 1,000 m = 1 km
Quantity  Basic unit  Symbol 

Length  meter  m 
Mass  kilogram  kg 
Time  second  s 
Electric current  ampere  A 
Thermodynamic temperature  kelvin  K 
Luminous intensity  candela  cd 
Multiplier  Prefix  Symbol 

10^{18}  exa  E 
10^{15}  peta  P 
10^{12}  Tera  T 
10^{9}  giga  G 
10^{6}  mega  M 
10^{3}  kilo  k 
10^{2}  hecto  h 
10  deka  da 
10^{2}  centi  c 
10^{3}  milli  m 
10^{6}  micro  µ 
10^{9}  nano  n 
10^{12}  pico  p 
10^{15}  femto  f 
10^{18}  atto  a 
References:
1. Fundamentals of Electric Circuits, 3rd Ed.
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1 pointsHow many basic units are there for the SI units.
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1 pointsWhat is the unit for luminous intensity?
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1 pointsHow many meters are there in 10 millimeters?
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1 pointsHow many kilograms are there in 20 hectograms?
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