Electric currents

What is a current as in electricity?什么是电中的电流？

• Current is the movement of water in a river电流是河流中水的运动

• Current is the flow of air in the atmosphere电流是大气中空气的流动

• Current is the movement of people in a crowd电流是人群中人们的运动

• Electric current is the flow of electric charge through a conductor.电流是电荷流过导体的流量。

The power source provides the ___ that drives the flow of electrons, conductors allow the electrons to move through the circuit, and the load uses the electric current to perform a specific task.电源提供驱动电子流动的 ___，导体允许电子在电路中移动，负载使用电流来执行特定任务。

What powers electronic devices in a circuit?是什么为电路中的电子设备供电？

• Protons质子

• Neutrons中子

• Photons光子

• Electrons电子

What are the essential components of an electric circuit?电路的基本组成部分是什么？

• Power source, conductors, and load电源、导体和负载

• Resistors, capacitors, and inductors

  电阻器、电容器和电感器

• Transistors, diodes, and transformers晶体管、二极管和变压器

• Switches, fuses, and relays开关、保险丝和继电器

What is important in designing and using electrical circuits?在设计和使用电路时，什么是重要的？

• Difference between DC and AC直流和交流的区别

• Voltage and current电压和电流

• Resistance and capacitance电阻和电容

• Magnetic fields and electric fields磁场和电场

What are the differences between DC and AC electric currents?直流电流和交流电流有什么区别？

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How does increasing the number of amps in a power source affect the bulb in a circuit?增加电源中的安培数如何影响电路中的灯泡？

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How do you make a bulb brighter?如何让灯泡更亮？

• By using a lower wattage bulb通过使用较低瓦数的灯泡

• By using a higher wattage bulb or by increasing the voltage, or adding more batteries.通过使用更高瓦数的灯泡或增加电压，或添加更多电池。

• By decreasing the voltage通过降低电压

• By turning off the switch repeatedly通过反复关闭开关

What is the purpose of a resistor in an electrical circuit?电阻器在电路中的用途是什么？

• To store electrical energy储存电能

• To regulate the flow of current调节电流

• To generate magnetic fields产生磁场

• To convert electrical energy into heat将电能转化为热能

What is the function of a diode(A diode is a two-terminal electronic component) in an electrical circuit?二极管（二极管是两端电子元件）在电路中的作用是什么？

• To amplify electrical signals放大电信号

• To store electrical charge储存电荷

• To control the flow of current in one direction控制一个方向的电流

• To convert electrical energy into mechanical energy将电能转换为机械能