P219lecture03electricpotential - Goal To understand...

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Goal: To understand electric potential and electric potential energy Objectives: 1) To compare Electric potential energy to gravitational potential energy. 2) To Compare Electric Potential to Electric force. 3) To learn how to Find the Electric Potential energy. 4) To understand the similarities and differences between Voltage and energy 5) To learn about Equipotential surfaces 6) To understand how to find the electric Potential in a Uniform Electric Field
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Revisit of Gravitational Potential Energy Potential energy is the energy you can get from letting something move. For gravity if you drop something you can convert Potential Energy to Kinetic. The energy you get is approximately the force times the distance (yes that is similar to work).
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Electric Potential Energy Electric Potential energy is the same. It is the potential energy between any two charges. Energy is a force times a distance, so if you multiply the Electric Force times a distance (I am oversimplifying a little here) you get the Electric Potential. U = k q1 q2 / r (and is in units of Joules) Note how similar it looks to the equation for the force.
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Sample problem Calculate the electric potential energy between the following 2 charges: Q1 = 5C, and is located at x = 3 m, Q2 = - 3C, and is located at x = -2 m.
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Negative energy?
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