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Electromagnetism:

Charge coulomb C 1 A.s [current].[time].
[power]/[current].
-1

Potential volt V 1 W.A Only differences are

measurable!
[Δpotential]/[current

-1
Resistance ohm Ω 1 V.A
].

-1

Conductance siemens S 1 A.V [current]/[Δpotential

].

-1

Capacitance farad F 1 C.V [charge]/[Δpotential]

.
-1 [Δpotential]/[rate of

Inductance henry H 1 V.s.A
change of current].
-1
Magnetic flux weber Wb 1 J.A [energy]/[current].
- [magnetic
Magnetic flux 1 Wb.m

density tesla T 2 flux]/[area]. Also
magnetic induction.
Optics:
[luminosity].[solid

Luminous flux lumen lm 1 cd.sr
angle].
-2 [luminous

Illuminance lux lx 1 lm.m
flux]/[area].

-1
Convergence dioptry dioptry 1 m Inverse of focal

length.
Radioactivity and radiation:

-1
Activity becquere Bq 1 s [number of decay

l events]/[time].

-1

Absorbed dose gray Gy 1 J.kg [energy]/[mass].
[energy]/[mass].
Absorbed dose re-

-1
Dose equivalent sievert Sv 1 J.kg
normalized by

biological effects.
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