1.1.1 We consider the flow of electric charges. A unique feature of electric charge or electricity is the fact that it is mobile; that is, it can be transferred from one place to another, where it can be converted to another form of energy.
我们认为电荷是流动的。电荷和电的特点是它具有流动性；即它可以从一个地方转移到另一个地方，在转移的过程中，电荷或电能转变为另一种形式的能量。
1.1.2 The power absorbed or supplied by an element is the product of the voltage across the element and the current through it.新快乐人生>摩羯座双鱼座
一个元件吸收或者发出的功率是元件两端的电压和通过该元件的电流的乘积。
1.2.1 We might obrve at this point that the polarity marks on Fig.1-4(b) are redundant since the polarity could be defined by the positions of the longer and shorter lines.
大家或许注意到图1-4(b)所标注的极性是多余的。因为恒压源的极性可以用长线、短线来定义。
1.2.2 It should be noted that an ideal voltage source (dependent or independent) will produce any current required to ensure that the terminal voltage is as stated, whereas an ideal current source will produce the necessary voltage to ensure the stated current flow.
应该注意一个理想电压源，(独立和受控)可向电路提供任意电流，以保证其端电压为规定值，而理想电流源，可向电路提供任意电压以保证其规定电流。
1.4.1 Still anther class of relationship is one between veral variables of the same type which occurs as the result of the network configuration, i.e., the manner in which the various element of the network are interconnected.
另一类关系由于网络结构，即网络的不同元件互相连接的方式所产生的相同形式的一些变量间的关系。
1.4.2 Kirchhoff’s Current Law is bad on the law of conrvation of charge, which requires that the algebraic sum of charges within a system can not change.
向多本
基尔霍夫电流定律基于电荷守恒定律，要求一个系统内电荷的代数和不变。
1.5.1 Since a voltage is defined as existing between two nodes, it is convenient to lect one node in the network to be a reference node or datum node and then associate a voltage or a potential with each of the other nodes.
由于电压定义为两个节点之间的相对变量，一个方便的做法是选择网络中的一个节点作为参考节点或基准节点，从而确定其他所有节点的电压和电位。
1.5.2 Mesh analysis is not quite as general as nodal analysis becau it is only applicable to a circuit is planar.
由于网孔分析法仅适用于平面电路，故网孔分析法不像节点分析法那样通用。
1.6.1 We can proceed to our simplification of sinusoidal steady-state analysis by establishing the relationship between the phasor voltage and phasor current for each of the three passive elements.
通过建立三种无源元件各自的电压相量和电流相量之间的关系，我们可以对正弦稳态分析进行简化。
学而时习之的之1.6.2 On the other hand, delta-connected sources are not common in practice becau of the circulating current that will result in the delta-mesh if the three-pha voltage are slightly unbalanced.
另一方面，实际中三角形连接的电源并不常用，因为三相电压稍有不平衡就会在三角形连接的网孔中产生循环电流。
2.1.1 In every aspect of our increasingly technological society ---whether it is science, engineering, medicine, music, maintenance, or even espionage ---the role of electronics is large, and it is growing.
土城小学在日益发展的科技社会中，的每一方面，无论是科学，工程，医学，音乐，维修，甚至是谍报，电子学的作用都是非常大的，而且越来越重要。
2.1.2 This information might involve speech and music, as in radio broadcasting, a
physical quantity such as the temperature of the air in a room, or numerical data, such as the record of the stock market transactions.
这种信息或许像无线广播的演讲和音乐，或许是像室内温度的物理量，或许像股市交易记录的数字数据。
2.2.1 Boole and others were interested in developing a systematic means of deciding whether proposition in logic or mathematics was true or fal, but we shall be concerned only with validity of the output of digital devices.
安卓怎么刷机布尔和其他研究者致力于发展一种证明逻辑上或数学中命题的真假问题的系统方法，而我们只关心数字设备输出的正确性。
3.1.1 Assume that initially the switch is on, hence, the current through the switch is . The capacitor voltage is , the voltage across the switch is zero and the diode V1 is rever biad.
假设开始时开关处于闭合状态，则通过开关的电流为Is，电容器的电压为Ug，开关两端的
电压为零，二极管V1反向偏置
质数数列3.2.1 It must, however, be kept in mind that a step-down voltage converter is also a step-up current converter and vice versa becau the input power must equal the output power.
因为输入功率必须等于输出功率，必须牢记降压电压变换器也是升流的电流变换器，反之亦然。
3.2.2 A prominent application of the Buck converter is a DC regulated power supply in which the output voltage is regulated against the variations in the load resistance and the input voltages.
红茶的泡法降压式变换器的一个著名应用是用于直流可调电源，调整其输出电压以补偿负荷电阻和输入电压的变化。
4.1.1 Whereas the copper disk will rotate in the same direction as the rotating magnetic field, it will never reach the same speed as the rotating magnet, becau i
f it did, would be no relative motion between the two and therefore no current induced in the copper disk.
尽管铜盘将以与旋转磁场方向相同的方向转动，但它却达不到旋转磁场的转速。因为如果铜盘达到了旋转磁场的转速，它们之间就没有相对运动，那么铜盘中就不会产生感应电流。
