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ELECTRIC POTENTIAL Electric Potential: Energy a charge has due to its position in an electric field. EPE distance Electrical Potential Difference • Work done per unit of charge as a charge moves through a field V = W/q W- work(joules) q- Charge(coulombs) V-Potential difference J/C or Volt example • A 12 volt battery does 1200J of work transferring a charge through an electric field. How much charge is transferred? V = W/q 12V = 1200J/q q = 100C Capacitor • Two parallel plates that collect and store electrical energy to be used at a later time. Dielectric-Placed in a capacitor to allow it to store more charge Nonmetallic substance that will allow the electric field to be maintained Potential Between Parallel Plates V=Ed V- electric potential (volts) E- electric field intensity (N/C) d= distance between plates (m) Example A)Two plates of a capacitor are 0.03m apart. What is the potential difference if they have an electric field of 3000N/C? V= Ed V= 3000N/C(0.03m) V= 90Nm/C = 90J/C = 90V B) What work is needed to move an electron from the (+) plate to the (-) plate of the capacitor? V=W/q 90V= W/(1.6x10-19C) W= 1.44x10-17J Field intensity + + + + + + + + q q q - - - - - - - Electric field is uniform regardless of where the charge is placed