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Electromechanical products Compabloc 1000

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8<br />

General information<br />

Units of measurement and standard formulae<br />

ELECTRICITY AND ELECTROMAGNETISM<br />

Quantity Units<br />

Name French name Symbol Definition SI<br />

Frequency Fréquence<br />

Période<br />

f 1<br />

f =<br />

T<br />

Hz (hertz)<br />

Electric current Courant électrique<br />

(intensité de)<br />

I A (amps)<br />

Electrical potential Potentiel électrique V V (volt)<br />

Voltage Tension U<br />

Electromotive force Force électromotrice E<br />

Non SI,<br />

but accepted<br />

Phase angle Déphasage ϕ U = Um cosωt rad ° degree<br />

i = im cos (ωt -ϕ)<br />

Power factor Facteur de puissance cos ϕ<br />

Reactance Réactance X Z = IZI jϕ<br />

Resistance Résistance R = R + jX Ω (ohm)<br />

IZI = √ R 2 + X 2<br />

Impedance Impédance Z<br />

X = Lω −<br />

1<br />

Cω<br />

Self inductance Inductance propre (self) L<br />

Φ H (henry)<br />

L =<br />

I<br />

Capacitance Capacité C Q<br />

C =<br />

V<br />

F (farad)<br />

Charge électrique, Q Q = ∫Ιdt C (coulomb) A.h<br />

Quantity of electricity Quantité d'électricité<br />

1 A.h = 3600 C<br />

Resistivity Résistivité ρ<br />

R.S<br />

ρ =<br />

I<br />

Ω .m Ω /m<br />

Conductance Conductance G<br />

Number of turns (coil) Nombre de tours (spires)<br />

de l'enroulement<br />

N<br />

Number of phases Nombre de phases m<br />

Number of pairs of poles Nombre de paires de pôles p<br />

Units and expressions<br />

not recommended<br />

Conversion<br />

1 S (siemens) 1/ Ω = 1S<br />

G =<br />

R<br />

Magnetic field Champ magnétique H A/m<br />

Magnetic potential difference Différence de potentiel Um A<br />

magnétique<br />

Magnetomotive force Force magnétomotrice F, Fm F = φHs ds<br />

Solénation, courant totalisé H H = NI<br />

Magnetic induction<br />

Induction magnétique, B T (Tesla) = Wb/m<br />

Magnetic flux density Densité de flux magnétique<br />

2 (gauss) 1 G = 10-4 T<br />

Magnetic flux Flux magnétique,<br />

Φ Φ = ƒƒs Bn ds Wb (weber) (maxwell)<br />

Flux d'induction magnétique<br />

1 max = 10-8 The unit AT (ampere-turns)<br />

is incorrect because it treats<br />

"turn" as a physical unit<br />

Wb<br />

Magnetic vector potential Potentiel vecteur magnétique A Wb/m<br />

Permeability Perméabilité d'un milieu µ = µo µr B = µH H/m<br />

Permeability of vacuum Perméabilité du vide µo µo = 4π10 -7 H/m<br />

Permittivity Permittivité ε = εoεr 1<br />

36 π 10<br />

F/m<br />

9<br />

εo = F/m<br />

j is defined as j 2 = -1<br />

ω pulsation = 2 π . f

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