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notes4 2317 - ECE 2317 Applied Electricity and Magnetism...

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Prof. David R. Jackson ECE Dept. Spring 2011 Notes 4 ECE 2317 ECE 2317 Applied Electricity and Magnetism Applied Electricity and Magnetism Notes prepared by the EM Group University of Houston

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or Electric Field Electric Field + + + + + + + + + + + + - - - - - - - - - - - - + - V 0 E F q E = 1 E F q The electric-field vector is the force vector for a unit charge. Units of electric field: [ V/m ] q Note: The “test” charge is small enough so that it does not disturb the charge on the capacitor.
Electric Field (cont.) Electric Field (cont.) 2 0 ˆ 4 q E r r πε = Note: The electric-field vector may be non-uniform. E q point charge q in free space:

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Voltage Drop Voltage Drop E F q E = The voltage drop between two points is now defined. C A B E ( x,y,z ) q test charge F ext ( x,y,z ) The test charge is moved from point A to point B at a constant speed (no increase in kinetic energy). ext E F F q E = - = - Volta
Voltage Drop (cont.) Voltage Drop (cont.) W ext = work done by observer in moving the charge. B B B ext ext A A A W F dr q E dr q E dr = = - = - C A B E ( x,y,z ) F ext ( x,y,z ) q test charge

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Voltage Drop (cont.) Voltage Drop (cont.) B ext A W q E dr
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This note was uploaded on 08/05/2011 for the course ECE 2317 taught by Professor Staff during the Spring '08 term at University of Houston.

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notes4 2317 - ECE 2317 Applied Electricity and Magnetism...

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