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

与基本关相比，三路关有一个公共端子和两个旅行端子。

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

在路中，将此效应建模为池端子之间内阻。

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

在路中，可以将此效应建模为池端子之间内阻。

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，当测量池端子之间实际压时， 会得到一个低于我们理想动。

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，当测量池端子之间实际压时，会得到低于我们理想动位读数。

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， 当拨动关被拨动时，公共端子从与一个旅行者接触变为与另一个旅行者接触。

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.

如果曾经在… … 任何东西中安装过池… … 也知道池一个端子称为正极，另一个称为负极。

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

这里我们有一个金属条或轨道， 连接到公共端子， 还有两个旅行者金属条，每个金属条都连接到自己独立旅行者端子。

This metal contact bar springs upward thereby allowing the two contact points to touch  and electricity to flow from one screw terminal to the other, thus closing the circuit and powering  the light.

该金属接触条向上弹起， 从而允许两个接触点接触， 流从一个螺丝端子流向另一个螺丝端子，从而闭合路并为供。