Energy in Electric and Magnetic Fields
电场和磁场中的能量
Both electric fields and magnetic fields store energy. For the electric field the energy density is
电场和磁场都储存能量。对于电场来说，能量密度是
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This energy density can be used to calculate the energy stored in a capacitor.
这种能量密度可用于计算电容器中储存的能量。
For the magnetic field the energy density is
对于磁场的能量密度是
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which is used to calculate the energy stored in an inductor.
这用于计算电感器中储存的能
For electromagnetic waves, both the electric and magnetic fields play a role in the transport of energy. This power is expressed in terms of the Poynting vector.
对于电磁波来说，电场和磁场在能量的传输中都起着作用。这种功率可以表示为坡印廷矢量。
Voltage concepts
Electric field concepts
索引 电压概念 电场概念
| HyperPhysics***** Electricity and Magnetism
HyperPhysics ***** 电学和磁学 | R Nave |
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