## Equations of Electricity

also called Ohm's Law | Voltage or Potential Difference=Current*Resistance |

Power=Voltage or Potential Difference*Current | |

Charge=Current*time | |

Work Done =Charge*Potential Difference | |

Gives the Resistance of a wire in terms of it's resistivity, length and cross sectional area | |

Current=number of free charges per unit volume*cross sectional area*speed of free charges*unit charge | |

EMF=Output Voltage+Lost Volts (Volts which must must be used to push the current against the internal resistance of the battery) | |

For Resistors in Series | |

For Resistors in Parallel | |

Potential Divider Equation. | |

Charge=Voltage*Capacitance | |

For Capacitors in Parallel | |

For Capacitors in Series | |

Energy Stored on Capacitor | |

Energy Stored in Inductor | |

Reactance of Capacitor | |

Reactance of Inductor | |

Ohm's Law for Circuit with Inductance | |

Current into a Junction =Current out | Kirchoff's First Law |

Sum of EMF's in a closed circuit = Sum of Potential Differences | Kirchoff's Second Law |

Force between point chargesand separated by distance | |

Potential energy for two chargesand separated by distance | |

Electric field at distancefrom point charge | |

Electric potential at distancefrom point charge |