Derived SI units

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Derived SI units

Quantity

Name of unit

Symbol

Equivalent

Reciprocal

frequency

hertz

Hz

energy

joule

J

0.2388 calories

1 cal = 4.1868 J

force

newton

N

0.225 pounds force

1 lbf = 4.448 N

power

watt

W

0.00134 horse power

1 hp = 745.7 W

pressure

pascal

Pa

0.00689 pounds force/sq. inch

1 lbf/sq. in = 145 Pa

electric charge

coulomb

C

electric potential difference

volt

V

electric resistance

ohm

Ω

electric conductance

siemens

S

electric capacitance

farad

F

magnetic flux

weber

Wb

inductance

henry

H

magnetic flux density

tesla

T

luminous flux

lumen

lm

illuminance

lux

lx

absorbed dose

gray

Gy

activity

becquerel

Bq

dose equivalent

sievert

Sv