Capacitive Reactance电容 reactance
The AC impedance of a capacitor is called capacitive reactance. It decreases with increasing frequency. 电容器的交流阻抗称为容抗。它随着频率的增加而减小。
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Index Capacitance concepts Inductance concepts 电容概念 感应概念 | ||
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Electric Charge电荷
The unit of electric charge is the coulomb. Ordinary matter is made up of atoms which have positively charged nuclei and negatively charged electrons surrounding them. Charge is quantized as a multiple of the electron or proton charge:  The influence of charges is characterized in terms of the forces between them (Coulomb's law) and the electric field and voltage produced by them. One coulomb of charge is the charge which would flow through a 120 watt lightbulb (120 volts AC) in one second. Two charges of one coulomb each separated by a meter would repel each other with a force of about a million tons! 电荷的单位是库仑。普通物质由原子组成，这些原子具有带正电的原子核和围绕它们的带负电的电子。电荷是量子化的，是电子或质子电荷的整数倍：电荷之间的相互作用通过它们之间的力（库仑定律）以及它们产生的电场和电压来表征。一库仑的电荷是通过120瓦灯泡（120伏交流电）在一秒内流动的电荷量。两个各为一库仑的电荷相距一米时，它们之间会相互排斥，力大约是一百万吨！
The rate of flow of electric charge is called electric current and is measured in amperes. 电荷流动的速率称为电流，单位是安培。 |
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