用玻印廷矢量解析稳恒电路中的能量传输问题

Study on Transmission of Energy in Steady Circuit Using Poynting's Vector

本文利用玻印廷矢量Ｓ＝Ｅ×Ｈ，即用电磁场中能流密度矢量分析稳恒电路中能量传输过程，较清晰地给出稳恒电路中能量传输的物理图象，从而得出稳恒电路中能量不是通过电流沿导线内部从电源传给负载的，而是通过空间的电磁场，从导线侧面输入的。

In this paper,process of transmission of energy in steady circuit is analysed by using Poynting's vector S =E ×H ,which is vector of electromagnetic energy flux density.Physical picture of transmission of energy in steady circuit is given clearly.It is indicated that energy of steady circuit don't pass through inside of wire,but input from lead's side by means of electromagnetic field.