Road Map Getting closer!! Electrostatics Circuits Non-moving Charges Moving Charges Electric Field Electric Potential The Great Opposites of Our Time Gravity has only one direction While Electric Charges/Electric fields have two directions. Happy/Sad Hot/Cold Clemson/Universit y of SC Electric Potential Electric charges both generate and react to the electric field, but they also warp the field three-dimensionally Electric Potential Electric Potential the steepness or warping of the electric field due to the presence of an electric charge. Measuring Electric Potential Two ways!! Method #1 If you know the value of the point charge .the electric potential can be measured based on distance V = Electric Potential k = 8.99 x 10 9 q = point charge (no absolute value) r = distance away SI Unit for Electric Potential: Volt (v) Example 5 A.Calculate the electric potential from a point source (+4.65 x C) at a distance of 2.50 m away and 4.00 m away. B.How far away from a point source ( x C) would you have to be to have an electric potential of -550 v? Example 6 Two point charges (q 1 and q 2 ) are located in the same plane. The first charge (q 1 ) has a charge of C and is located at point (0, 1.00). The second charge (q 2 ) has a charge of C and is located at point (2.00, 0). A.What is the value of the electric potential at the origin from q 1 ? B.What is the value of the electric potential at the origin from q 2 ? C.What is the net electric potential at the origin? Electric Potential Method #2 Electric Potential is measured as the electric potential energy (EPE) per unit charge. q = electric charge EPE = Electric Potential Energy Measured in Joules V = Electric Potential Electric Potential Energy Electric Potential Energy results when we move, push, or force charged particles against their will. + + We have to do work to move a charge against its will. Work done by me = Energy gained by particle SI Unit for Energy: Joules (J)