...e. As a result, the opposition by the capacitor to the current flow in the circuit will be less when the frequency increases. That is, the reactance of the capacitor is inversely proportional to the angular frequency (ω) of the AC. Thus, the capacitive reactance is defined as C是电容器的电容...
串联与并联电路 电路可以用许多方法建立。电阻、二极管、开关等电子器件是放置在电路结构中的元件。这些元件的放置对电路的运行至关重要,因为不同的设置会产生不同的输出、结果或目的。两种最简单的电子或电气连接...
...g downwards, and so there will be an upward resistive force on the paper. 如何计算物体在空中缓慢下落时的空气阻力 For objects which move slowly relative to the air (such as falling dust particles), the resistive force is directly proportional to the object’s velocity relative...
...失有关。 什么是电位差(potential difference)? In an electrical circuit, the potential difference between any two points in the circuit is the energy lost by a coulomb of charge as it travels between those two points. Potential difference can be measured using a voltmeter, and it is exp...
...便它们之间都具有相同的电位差。 什么是串联电路(series circuits)? 在串联电路中,元件之间没有连接。然后,根据电荷守恒定律(基尔霍夫第一定律),它们有相同的电流流过。如果电路在任何一点断开,电流将完全停止流过...
... 什么是抵抗(resistance)? The resistance ( ) of a component in a circuit is the potential difference ( ) across the component divided by the current ( ) through the component: 如果在由交流电供电的电路上加一个电阻器,电流的变化将与电压的变化同时发生。 Cur...
...at causes them to oppose changes in current when they are connected in AC circuits. Reactance depends on the frequency of the AC current. For example, for a capacitor with capacitance in an AC circuit with a frequency , the capacitive reactance is given by For an inductor with inductance ,...
... in one direction. As the electr*** flow through various components in the circuit, they lose their electrical energy. DC power refers to the amount of energy dissipated per second by a coulomb of electr***, as they travel between two points in a circuit. In a DC circuit, if a component has a po...
...的电流之比。下图显示了电阻器的两个标准电路符号: Circuit symbols of resistors 在物理上,电阻器通常如下所示: A resistor 广义上讲,电阻器可分为两类:固定电阻器和可变电阻器。正如他们的名字所暗示的,固定电阻器的电阻是...
...一个串联RLC电路。在这里,我们分析了以下电路: An AC circuit containing a resistor, a capacitor and an inductor To recap, the capacitor has a capacitive reactance ( ) given by . The inductor has an inductive reactance ( ) given by . We saw that the magnitude of the total ...