ch19_print - Electrical Potential Energy and Electric...

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Unformatted text preview: Electrical Potential Energy and Electric Potential 1 Potential Energy and Electric Potential The Coulomb force law is of the same form as the universal law of gravity the electrostatic force is a conservative force. Example: A small positive test charge, q , in a uniform electric field E : Work done by gravity: W = F s = mg ( h- h ) Work done by constant elec. force: W = F s = | q | E s Work=Change in PE : W =- GPE = GPE- GPE W =- EPE = EPE- EPE Dr.D.Wackeroth Spring 2005 PHY102A Electrical Potential Energy and Electric Potential A positive charge gains electric potential energy when it is moved in a direction opposite the electric field. A negative charge loses electric potential energy when it is moved in a direction opposite the electric field. Energy Conservation: W = 0 J E = E- E = 0 J The total energy, E , of the universe does not change. Energy can only be transformed between different forms of energy but can never be destroyed or created out of nothing. E = 1 2 mv 2 + 1 2 I 2 + mgh + 1 2 kx 2 + EPE (1) Dr.D.Wackeroth Spring 2005 PHY102A Electrical Potential Energy and Electric Potential Electric Potential: The potential difference between points A and B , V = V- V , is defined as the change in electric potential energy of a charge, q , moved from A to B , divided by the charge....
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This note was uploaded on 02/12/2012 for the course PHYSICS 104 taught by Professor Staff during the Fall '10 term at Rutgers.

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ch19_print - Electrical Potential Energy and Electric...

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