In a circuit, you model this effect as an internal resistance between the battery’s terminals.

在电路中，您将此效应建模为电池之间的内阻。

In a circuit, you model this effect as an internal resistance between the battery's terminals.

在电路中，您可以将此效应建模为电池之间的内阻。

And electricity to flow from one screw terminal to the other, thus closing the circuit and powering the light.

并且电流从一个螺流向另一个螺，从而闭合电路并点亮灯光。

In contrast to the basic light switch, three-way switches have a common terminal and two traveler terminals.

基本的电灯开关相比，三路开关有一个公共和两个旅行。

Furthermore, we can see that for clockwise and counterclockwise rotation of the potentiometer, we use a set of three terminals.

此外， 我们可以看到， 对于电位器的顺时针和逆时针旋转，我们使用一组三个。

These travelers are a pair of wires that travel through the walls in order to connect one light switch to the other.

这些旅行是一对穿过墙壁的电线，用于连接一个拨动开关到另一个。

So, when you measure the actual voltage between the terminals of the battery, you get a value that’s less than our ideal emf potential.

因此，当您测量电池之间的实际电压时， 您会得到一个低于我们理想的电动势的值。

So, when you measure the actual voltage between the terminals of the battery, you get a value that's less than our ideal emf potential.

因此，当您测量电池之间的实际电压时，您会得到低于我们理想电动势电位的读数。

Instead of a common and two travelers as we saw in the three-way switch, four-way switches use two sets of two travelers.

三路开关中使用的公共和两个旅行不同，四路开关使用两组旅行。

As you can see, the path of the electricity is flipped from each pair of traveler terminals to the other pair

如你所见，电流路径在每一对旅行之间进行了切换。

Now, when the toggle switch is flipped, the common terminal moves from being in contact with one traveler to being in contact with the other traveler.

现在， 当拨动开关被切换时，公共会从一个旅行接触变为另一个旅行接触。

Now, if you've ever installed a battery in… anything… you also know that one terminal of a battery is called positive and the other one is negative.

如果您曾经在… … 任何东西中安装过电池… … 您也知道电池的一个称为正极，另一个称为负极。

When the toggle is flipped, the two pairs of travelers on the left change to being connected to the opposite traveler on the right.

当拨动开关翻转时，左边的两对旅行会改变为右边的相反旅行连接。

Here we have a metal bar or track connected to the common terminal along with two traveler metal bars, each connected to their own separate traveler terminals.

这里有一根金属条或轨道连接到公共， 同时还有两根旅行者金属条，每根分别连接到各自的独立旅行者上。

Now we add a third terminal up on top there, and depending on the voltage between the left and right terminal and that third voltage, you can change that current.

现在我们在顶部再加一个第三个，根据左和右之间的电压以及这个第三电压，你可以改变那个电流。

The shape of the bottom of the toggle is critical and makes it such that at any given time only one traveler is in contact with the common.

拨动开关底部的形状至关重要，确保在任何时刻只有一个旅行公共接触。

When we flip the toggle switch, one traveler is pushed away from the common by the bottom of the toggle switch, while the other traveler is in contact with the common.

当我们拨动拨动开关时，一个旅行被开关底部推离公共，而另一个旅行则公共接触。