Electric+Potentials

= Electric Potential and Electric Energy =

Electric potential energy is the change in potentialenergy as a certain charge is moved between two points

dividing the potential energy by the test charge gives electric potential, and has a value at every point in an electric field. Electric potential is abbreviated V. V is also a scalar quantity V = Pe/ q One volt is equal to one joule per coloum Electric potential can be energy per charge, electric potential difference or voltage difference the amount of work for moving a charge through an electric field at constant velocity is W = qdeltaV The electric field can be seen as a measure of the rate of change with position of the electric potential. An electron volt is the energy a charge-field system gains or loses when a charge of magnitude e is moved through a potentail difference of 1V. - 1eV = 1.6x10^-19

equipotential lines run perpendicular to field lines at any point, and electric field lines always point in the direction of decreasing electric potential. - a system consisting of a + charge and an electric field loses electric potentail energy when the charge moves in the direction of the field file:///Users/michael/Pictures/iPhoto%20Library/Modified/2012/May%2013,%202012/IMG_0772.jpg no energy is required to move a charged object along an equipotential surface NO POTENTIAL DIFFERENCE electric potential of lines depend on distance from sources potential. the lines are parallel to charged parallel plates, they are in the concentric circles around single charges. E = electric potential as + charge moves with E Ue drops as - charge moves against E Ue drops drop in Ue causes kinetic energy to increase

a capacitor is a charge storing devise, two conducting parallel plates plates become equally and poositely charged when capacitor is in a circuit the charge on each plate is related to volts given by Q=VC, where c is the capacitance. C = the permittivity of space(8.85e-12)A/d ΔV = U / q
 * Electric Potential Difference between two points in a uniform electric field: ΔV = -Ed
 * The electric potential created by a point charge at any distance r from the charge is: V = ke(q/r)
 * Electric Potential Energy of a system of two charged particles: U = ke (q1q2)/ r12
 * The voltage difference across a resistor is given by: ΔV = IR
 * Power given off by a low resistor: P = IΔV = I2R = V2/R