3. International Unit System SI:International Unit System
The International Unit System (SI) is a consistent unit system that considers both the fundamental unit and the derived unit as elements.
Electricity related SI derived unit | ||
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physical quantity | Unit | Unit Symbol |
Time |
Second |
S |
Length |
Metre |
m |
Mass |
kilogram |
kg |
Electric current |
ampere |
A |
Temperature |
kelvin |
K |
Amount of material |
mole |
mol |
Brightness |
candela |
cd |
Plane angle |
radian |
rad |
Solid angle |
steradian |
sr |
Example of derived unit | ||||
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Physical quantity | Unit | Unit Symbol | Representation of SI Base Units | Representation of other SI Units |
Area |
Square meter |
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Cubic volume |
Cubic meter |
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Density |
Kilogram/Cubic meter |
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Velocity, Speed |
Meter/Second |
m/s |
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Accelerated velocity |
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Angular velocity |
Radian/Second |
rad/s |
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Electrical current density |
Ampere/Square meter |
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Magnetic field intensity |
Ampere/Meter |
A/m |
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Magnetomotive force, magnetic potential difference |
Ampere |
A |
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Molar concentration |
Mole/Cubic meter |
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Brightness |
Candela/Square meter |
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Wave number |
1/Meter |
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Amount of radiation exposure |
Coulomb«/Kilogram |
C/kg |
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Kinetic viscosity |
Square meter/Second |
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Number of vibration |
Cycles per second |
Hz |
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Electrical charge, electric charge |
Coulomb |
C |
s·A |
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Force |
Newton |
N |
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Celsius temperature |
degrees C |
℃ |
K |
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Radioactivity |
Becquere |
Bq |
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Moment of force |
Newton/meter |
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Surface tension |
Newton/meter |
N/m |
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Viscosity |
Pascal/second |
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Surface density of heat flow rate/ incident radiant flux density |
Watt/Square meter |
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Thermal capacity/entropy |
Joule/Kelvin |
J/K |
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Specific heat/mass entropy |
Joule/(kilogram ?E Kelvin) |
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Thermal conductivity |
Watt/(Meter Kelvin) |
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Electrical field intensity |
Bolt/meter |
V/m |
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Dielectric displacement / dielectric displacement |
Coulomb/square meter |
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Dielectric constant |
Farad/meter |
F/m |
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Magnetic permeability |
Henry/meter |
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Absorbed dose |
Gray |
Gy |
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J/kg |
Dose equivalent |
Sievert |
Sv |
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J/kg |
Pressure, stress |
Pascal |
Pa |
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Energy, work, and amount of heat |
Joule |
J |
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N·m |
Power, electrical power |
Watt |
W |
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J/s |
Electrical voltage, electric potential |
Bolt |
V |
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W/A |
Capacitance |
Farad |
F |
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C/V |
Electrical resistance |
Ohm |
Ω |
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V/A |
Conductance |
Siemens |
S |
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A/V |
Flux |
Weber |
Wb |
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V·s |
Magnetic flux density |
Tesla |
T |
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Inductance |
Henry |
H |
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Wb/A |
Light flux |
Lumen |
lm |
cd·sr |
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Illuminance |
Lux |
lx |
lm/m |