供作电介质用途的有机化合物,在一定的频率和电压梯度之下,由于束缚的电荷的周期位移而引起了电流的流动,这种作用称为极化;且由此作用而产生的电流,称为位移电流,它的大小系与介电常数成正比。根据德拜(Debye)的偶极理论,分子因外加电场而起的极化,可用下列方程式表示之: The organic compounds used for dielectrics, under a certain frequency and voltage gradient, cause the current to flow due to the periodic displacement of the bound charge. This effect is called polarization; and the resulting current, called For the displacement current, its size is proportional to the dielectric constant. According to Debye’s dipole theory, the polarization of a molecule due to an applied electric field can be expressed by the following equation: