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PHY213_Chapter16_Sec1to4

# PHY213_Chapter16_Sec1to4 - Chapter 16 Electrical Energy And...

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Chapter 16 Electrical Energy And Capacitance

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General Physics Electrical Energy Sections 1 – 4
General Physics Electric Potential Energy The electrostatic force is a conservative force It is possible to define an electrical potential energy function with this force Work done by a conservative force is equal to the negative of the change in potential energy

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General Physics Work and Potential Energy There is a uniform field between the two plates As the charge moves from A to B, work is done on it The change in potential energy between points A and B is ΔPE = -W = -qE x x Only for a uniform electric field ( ) ( ) x qE W x qE W x F W x = = = θ cos cos EX16.1
General Physics Potential Difference In general, the potential difference between points A and B is defined as the change in the potential energy (final value minus initial value) of a charge q moved from A to B divided by the size of the charge ΔV = V B – V A = ΔPE / q Potential difference is not the same as potential energy

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General Physics Potential Difference, cont. Another way to relate the energy and the potential difference: ΔPE = q ΔV Both electric potential energy and potential difference are scalar quantities Units of potential difference 1 V = 1 J/C A special case occurs when there is a uniform electric field V = V B – V A = -E x x Gives more information about units of E-field: N/C = V/m
General Physics Energy and Charge Movements A positive charge gains electrical potential energy when it is moved in a direction opposite the electric field When the electric field is directed

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PHY213_Chapter16_Sec1to4 - Chapter 16 Electrical Energy And...

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