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坡印廷矢量
坡印廷矢量与电路中能量的关系
——由一道大学物理题引出对坡印廷矢量的遐想
摘要：电路中能量的转变，储存，传输，都是以电磁场能量的形式进行的，作为电磁波的能流密度矢量——坡印廷矢量 是一个相当重要的物理量,它的引入，对于阐述电磁场与电磁波的能量传输及能量损耗有着十分重要的意义。
关键词：电磁场能量，坡印廷矢量，焦耳热，位移电流
The relation of poynting vector and electric circuit energy
-- The fancy of poynting vector derivate from a university physical
Zhang Ming
Abstract: The change, storage and deliver of energy in the electric circuit, are all acting in the form of electromagnetism field energy. As the density vector of electromagnetism field energy, pointing vector is a very important physics quantity, which plays a very important role in elaborating the energy delivery and the energy exhaustion in electromagnetism field and electromagnetic wave.
Keywords: Electromagnetism field energy, poynting vector, Joule hot, displacement current
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