formulate calculation in electricity
voltagevoltUU = R.I
intensityampsII = U ⁄ R
resistanceohmRR = U ⁄ I
quantityamps ⁄ hQQ = I.t
intensityampsAI = Q ⁄ t
timeSe ou Mi ou Hett = Q ⁄ I
resistanceohmRR = (p.l) ⁄ S
sectionmm²SS=(p.l) ⁄ R
resistivityomh ⁄ m ⁄ mm²pp=(R.S) ⁄ l
lengtmeterml=(R.S) ⁄ p
resistance at t°ohm ⁄ t°Rt°Rt = R0.(1 + a.t)
sectionmm²SS = (3.1415.d²) ⁄ 4
sectionmm²SS = (r.r.3.1415)
densityA ⁄ mm²JJ = I ⁄ S
equivalente resistance in serieohmReRe = R1 + R2 + Retc
equivalente resistance on ⁄⁄ohmRe1 sur Re = 1 sur R1 + 1 sur R2 etc
wheatstone    R1 sur R2 = R4 sur R3
potencielnewtonN1 Kg = 9.81 N
workjouleJ1 J = 1 N.1M
powerwattPP = W ⁄ t
powerwattPU.Q
powerwattPU.I.t
single phase powerwattPU.I.CosPhi
three phase power trianglewattPU.(I.1,7320).CosPhi
three phase power starwattP(U.1,7320).I.CosPhi
performance%n(éta)n = Pu ⁄ Pa
heatjouleQQ = R.I².t
resistanceohmRR = Q:(I².t)
specific heatjouleCQ = M.t°.C
voltage of a batteryvoltEE = U+u
intensityampsII = E ⁄ (R+r)
capacityamps/hourQQ = I.t
intensityampsII = Q ⁄ t
timeSe ou Mi ou Hett = Q ⁄ I
intensity accumulatorampsAI = (U-E) ⁄ (R+r)
fcemvoltEE = U-I.(R + r)
internal battery resistanceohmrr = ]U-E-(R.I)_ ⁄ I
magnetic field intensityamps ⁄ meterHH = I ⁄ D
transformation ratiocoéfficientKK = Up ⁄ Us
conductance S(siemens)siemensGG = 1 ⁄ R
conductivity S (siemens)siemensYY = 1 ⁄ p
capacity reactanceXcXcXc = 1 ⁄ (2*PI*f*C)
power factorCos phiCos phiCos phi = p ⁄ (u*i) or p ⁄ s
compensation capacitorQcQcQc = 3*u²*c*w
relation between current ⁄ chargeIcIcIc(t) = dq*(t) ⁄ dt
relation charge ⁄ potencial differenceQ(t)Q(t)Q(t) = C*]Vc*(t)_
relation charge ⁄ potencial differenceIc(t)Ic(t)Ic(t) = C*(dvc*t) ⁄ dt
equation breaking capacity,short circuit  L*(di ⁄ dt) = Er-Uarc-(R*I)
wind power wind turbine bladebetz limitP ventP vent = (1 ⁄ 2).p.S.v³
power of the wind turbinebetz limitP rotorP rotor = (1 ⁄ 2).cp.p.S.v³
power supplied by wind turbinePowerKwP = k * s * v²
Steinmetz formulaHysteresis lossww = k * V * F * Bnm

execution time customer :
runtime server : 0.245 seconds