An electric current is just a flow of electrons.

电流就是一股电子流。

A light bulb lights because its filament offers some resistance to the flow of electrons.

灯泡发光是因为灯丝对电子流动有一定的阻力。

But if the control electrode was given a negative charge, it would prevent the flow of electrons.

但如果向控制电极施加负电荷，它将阻止电子流动。

By applying a positive charge to the control electrode, it would permit the flow of electrons as before.

通过向控制电极施加正电荷使得电子可以流动。

That, though, happens only when the ion flow is balanced by a flow of electrons through an external circuit between the electrodes.

然而，只有当离子流被通过电极之间外部回路的电子流平衡时，这种情况才会发生。

But when we say that electricity is flowing, we're really talking about the flow of electrons.

但是当我们说电流流动时， 我们真的在谈论电子的流动吗？

Here's another example of a galvanic cell, one where the interesting part is the flow of whole ions instead of the flow of electrons.

这是原电池的另一个例子，其中有趣的部分是整个离子的流动而不是电子的流动。

Just like rocks and branches obstruct the passage of water, the materials used to conduct electricity have properties that impede the perfect flow of electrons.

正如岩石和树枝阻碍水的通过一样，用于导电的材料也具有阻止电子完美流动的特性。

But instead of being controlled by a current or a flow of electrons, each transistor basically trapped a single electron and stored it spins as information.

但不是由电流或电子流控制，每个晶体管基本上捕获一个电子并将其作为信息旋转存储。

Now, when the flow of electrons in these kinds of reactions are sent through a conductor, like a piece of metal, it can be used to do all sorts of work.

现在，当这些反应中的电子流通过导体时，比如一块金属， 它可以用来做各种工作。