Derived Units

Derived Units are expressed algebraically in terms of base units and for supplementary units.

Quantity

 

 

Name of derived Units

 

Symbol

 

 

Units involved

 

Frequency

Force

Pressure and stress

Work, energy, quantity of heat

Power

Quantity of electricity

Electric potential, potential difference, electromotive force

 

Electric capacitance

Electric resistance

Electric conductance

Magnetic flux, flux of magnetic induction

Magnetic flux density, magnetic induction

Inductance

Luminous flux

Illuminance

 

hertz

netwon

pascal

joule

watt

coulcomb

 

volt

 

farad

ohm

siemens

weber

tesla

henry

lumen

lux

 

Hz

N

Pa

J

W

C

 

V

 

F

W

S

Wb

T

H

lm

lx

 

 

1 Hz = 1 s-1 (1 cycle per second)

1 N = 1 kg m/s2

1 Pa = 1 N/m2

1 J = 1 N m

1 W = 1 J/s

1 C = 1 A s

 

1 V = 1 W/A

 

1 F = 1 As/V

1 W = 1 V/A

1 S = 1 W-1

1 Wb = 1V s

1 T = 1 Wb/m2

1 H = 1 Vs/A

1 lm = 1 cd sr

1 lx = 1 lm/m2