请将下述中文专业词汇翻译成英文 电流变换器 电压降落 等效电路 断路器 电势差 电容器 电阻器 2. 请翻译如下词汇(请特别注意之间的区别): electronic electronics electric electricity electrician electrical 3. 请翻译下内容(中) (1)When a conducting wire is connected to a battery (a source of electromotive force), the charges are compelled to move; positive charges move in one direction while negative charges move in the opposite direction. This motion of charges creates electric current. (2)Current direction and voltage polarity play a major role in determining the sign of power. It is therefore important that we pay attention to the relationship between current i and voltage u in Fig.1. 4. 请翻译下内容(中译英) (1)这个装置包括一个互感器和一个有两个电路的继电器系统。 (2)磁阻电动机以某一速率同步动转,该速率是由电源频率和定子绕制的级数决定的。