## 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