大学物理大学物理下 (14).ppt
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1、2-6.Electric Energy StorageObjectivesExplain how energy is stored in a capacitorCalculate the energy in a capacitor Determine the energy density in electric field.College Physics II平台标位置预留BA+q-qdqTo transfer an extra charge dq,the work will be:The total work to bring the total capacitor charge up to
2、 a final value Q is:Suppose charge q has been transferred from one plate of a capacitor to the other.College Physics II平台标位置预留This work is stored as electric potential energy U in the capacitor,It holds no matter what the geometry of the capacitor is.The potential energy of a charged capacitor may b
3、e viewed as being stored in the electric field between its plates.Where does the energy distribute?College Physics II平台标位置预留(Ad:the volume of capacitor)The energy density(energy per unit-volume)u is proportion to the square of E.So the stronger the electric field E is,the greater is the electric energy stored in the field.College Physics II平台标位置预留For parallel plate capacitor:Although we derived this result for the special case of a parallel-plate capacitor,it holds generally,whatever may be the source of the electric field.
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