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Circuit
电路
Do you have any idea what a circuit is?
你了解电路吗？
It is a road where electricity flows.
它就是电流经过的路。
How can you light a bulb using a battery?
怎么用电池点亮灯泡？
You have to connect a battery and a light bulb with two wires.
你得用两根电线连接电池和灯泡。
You need one wire to connect one end of the battery and a bulb first.
你要先用一根电线连接电池和灯泡的一端。
And you connect the other end of the battery and a bulb with another wire.
再用另一根电线连接电池和灯泡的另一端。
Then the bulb will be lit.
这样这个灯泡就会被点亮。
It is because electricity in the battery flows through the light bulb.
那是因为电池里的电流到了电灯泡里。
Where do we use circuits? Everywhere!
我们在哪里会用到电路？无处不用！
Because of circuits, we can make electricity flow inside machines.
因为有了电路，所以可以让电流到机器里面。
