System of Units

System of Units:

Physical QuantityUnitSymbol Used
Lengthmetrem
Mass kilogramkg
Timeseconds
TemperaturekelvinK
Electric CurrentampereA
Luminous Intensitycandelacd
Quantity of Mattermolemol
Plane Angleradianrad
Solid Anglesteradiansr
ForcenewtonN
FrequencyhertzHz
Electric ChargecoulombC
Work, EnergyjouleJ
PowerwattW
Potential DifferencevoltV
CapacitancefaradF
InductancehenryH
Luminous Fluxlumenlm
ResistanceohmΩ
Magnetic Field InductionteslaT
Magnetic Field Strengthampere/mA/m
Magnetic FluxweberWb

Some Practical Units:

1 Astronomical Unit (AU) = 1.496 x 1011 m ≃ 1.5 x 1011 m
1 Light Year (ly) = 9.46 x 1015 m = 6.3 x 104 AU
1 par sec = 3.1 x 1016 m = 3.26 ly
1 inch = 0.0254 m
1 foot = 0.3048 m
1 yard = 0.9144 m
1 mile = 1.609 x 103 m
1 nautical mile = 1.852 x 103 m
1 fermi or femtometre (fm) = 10-15 m
1 X-ray unit (X) = 10-13 m
1 picometre (pm) = 10-12 m
1 angstrom (Å) = 10-10 m
1 nanometre (nm) = 10-9 m
1 micron or micro-metre (µm) = 10-6 m
1 millimetre (mm) = 10-3 m
1 centimetre (cm) = 10-2 m
1 decimetre (dm) = 10-1 m
1 decametre (dam) = 10 m
1 hectometre (hm) = 102 m
1 kilometre (km) = 103 m
1 megametre (Mm) = 106 m
1 gigametre (Gm) = 109 m
1 terametre (Tm) = 1012 m
1 barn = 10-28 m2
1 acre = 4047 m2
1 hectare = 104 m2
1 tonne or metric ton = 1000 kg
1 quintal = 100 kg
1 slug = 14.57 kg
1 atomic mass unit (a.m.u) = 1.66 x 10-27 kg
1 solar year = 365.25 average solar days = 366.25 sidereal day
1 Lunar Month = 27.3 days
1 shake = 10-8 sec
1 bar = 760 torr

Metric Prefixes:

Power of 10PrefixSymbol
10-1decid
10-2centic
10-3millim
10-6microµ
10-9nanon
10-12picop
10-15femtof
10-18attoa
101decada
102hectoh
103kilok
106megaM
109gigaG
1012teraT
1015petaP
1018exaE

Young’s Double Slit Experiment
DC Generator or DC Dynamo
Interference and Its Types
Distinguish Between Cyclotron and Betatron
Variation of Thermo EMF with Temperature
Magnetic Elements of Earth
Eddy Currents- Definition, Prevention and Applications
Faraday’s Laws of Electromagnetic Induction
Characteristics of P-N Junction Diode
International System of Units– Wikipedia

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