| 1. | The difference between a direct and an alternating current is that a direct current always flows in one direction .
直流电和交流电的区别在于直流电总是向一个方向流动。 |
| 2. | A device used to convert direct current into alternating current
反用换流器用于变直流电为交流电的仪器 |
| 3. | Short - circuit currents in three - phase a . c . systems - part 0 : examples for the calculation of short - circuit currents iec tr 60909 - 4 : 2000
三相交流系统的短路电流.第0部分:短路交流电的计算范 |
| 4. | Used in the rated voltage 250v single - phase electric appliances which are mobile and used indoor or outdoor , and used to connect electric power
一用途供可移式户内或户外，家有或类似用途的，仅用于交流电的最高电压为250v的单相电器和电源连接的用途。 |
| 5. | Adjustable speed electrical power drive systems - part 4 : general requirements ; rating specifications for a . c . power drive systems above 1000 v a . c . , and not exceeding 35 kv
可调速的电气动力驱动系统.第4部分:一般要求.大于1000v但不超过35kv交流电的交流动力驱动系统的等级规范 |
| 6. | For some particular types of electrical products , certain additional safety requirements are stipulated in the regulation . for instance , a 110v a . c . electrical product shall carry a warning label
对于某些类别的电气产品，该规例亦订明须符合若干附加安全规格，例如110伏特交流电的电气产品须附有警告标签等。 |
| 7. | There are two kinds of secondary power supply in high - voltage dc electric system , one is dc / dc converter that converts 270vdc to 28vdc , the other is static converter that converts 270vdc to 115vac / 400hz
它的二次电源有两种，一种是把270vdc变换为28vdc的直流变换器，另一种是把270vdc变换为115v 400hz交流电的静止变流器。 |
| 8. | This paper expounds some difficult points in learning the alternating current of electrical engineering such as the effective value of ac , the functions of electrical inductance and capacitance on ac , the working principle of induction - motor and the transmit electricity
对电工学中有关交变电路学习的一些难点,如交流电的有效值,电感、电容对交变电流的作用,感应电动机的工作原理及输电等进行了阐述。 |
| 9. | Effects of current passing through the human body . part 2 : special aspects . chapter 4 : effects of alternating current with frequencies above 100 hz . chapter 5 : effects of special waveforms of current . chapter 6 : effects of unidirectional single impulse currents of short duration
通过人体的电流的效应.第2部分:特殊信号形式.第4章:频率在100hz以上的交流电的效应.第5章:特殊波形电流的效应.第6章:短时间单向脉冲电流效应 |
