formulate calculation in electricity |
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voltage | volt | U | U = R.I |

intensity | amps | I | I = U ⁄ R |

resistance | ohm | R | R = U ⁄ I |

quantity | amps ⁄ h | Q | Q = I.t |

intensity | amps | A | I = Q ⁄ t |

time | Se ou Mi ou He | t | t = Q ⁄ I |

resistance | ohm | R | R = (p.l) ⁄ S |

section | mm² | S | S=(p.l) ⁄ R |

resistivity | omh ⁄ m ⁄ mm² | p | p=(R.S) ⁄ l |

lengt | meter | m | l=(R.S) ⁄ p |

resistance at t° | ohm ⁄ t° | Rt° | Rt = R0.(1 + a.t) |

section | mm² | S | S = (3.1415.d²) ⁄ 4 |

section | mm² | S | S = (r.r.3.1415) |

density | A ⁄ mm² | J | J = I ⁄ S |

equivalente resistance in serie | ohm | Re | Re = R1 + R2 + Retc |

equivalente resistance on ⁄⁄ | ohm | Re | 1 sur Re = 1 sur R1 + 1 sur R2 etc |

wheatstone | R1 sur R2 = R4 sur R3 | ||

potenciel | newton | N | 1 Kg = 9.81 N |

work | joule | J | 1 J = 1 N.1M |

power | watt | P | P = W ⁄ t |

power | watt | P | U.Q |

power | watt | P | U.I.t |

single phase power | watt | P | U.I.CosPhi |

three phase power triangle | watt | P | U.(I.1,7320).CosPhi |

three phase power star | watt | P | (U.1,7320).I.CosPhi |

performance | % | n(éta) | n = Pu ⁄ Pa |

heat | joule | Q | Q = R.I².t |

resistance | ohm | R | R = Q:(I².t) |

specific heat | joule | C | Q = M.t°.C |

voltage of a battery | volt | E | E = U+u |

intensity | amps | I | I = E ⁄ (R+r) |

capacity | amps/hour | Q | Q = I.t |

intensity | amps | I | I = Q ⁄ t |

time | Se ou Mi ou He | t | t = Q ⁄ I |

intensity accumulator | amps | A | I = (U-E) ⁄ (R+r) |

fcem | volt | E | E = U-I.(R + r) |

internal battery resistance | ohm | r | r = ]U-E-(R.I)_ ⁄ I |

magnetic field intensity | amps ⁄ meter | H | H = I ⁄ D |

transformation ratio | coéfficient | K | K = Up ⁄ Us |

conductance S(siemens) | siemens | G | G = 1 ⁄ R |

conductivity S (siemens) | siemens | Y | Y = 1 ⁄ p |

capacity reactance | Xc | Xc | Xc = 1 ⁄ (2*PI*f*C) |

power factor | Cos phi | Cos phi | Cos phi = p ⁄ (u*i) or p ⁄ s |

compensation capacitor | Qc | Qc | Qc = 3*u²*c*w |

relation between current ⁄ charge | Ic | Ic | Ic(t) = dq*(t) ⁄ dt |

relation charge ⁄ potencial difference | Q(t) | Q(t) | Q(t) = C*]Vc*(t)_ |

relation charge ⁄ potencial difference | Ic(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 blade | betz limit | P vent | P vent = (1 ⁄ 2).p.S.v³ |

power of the wind turbine | betz limit | P rotor | P rotor = (1 ⁄ 2).cp.p.S.v³ |

power supplied by wind turbine | Power | Kw | P = k * s * v² |

Steinmetz formula | Hysteresis loss | w | w = k * V * F * B^{n}_{m} |

execution time customer :

runtime server : 0.006 seconds