To find out, we divide the voltage in the secondary coil by the voltage in the primary coil.

为了找出答案，我们将次级线圈中的电压除以 初级线圈中的电压。

And if it has fewer loops than the primary coil, so it decreases the voltage, that's a step-down transformer.

如果它的回路比初级线圈少，那么它会降低电压，那就是降压变压器。

So if the secondary coil has twice as many loops as the primary coil, it'll have twice as much voltage.

因此，如果次级线圈的回路数是初级线圈的两倍，那么它的电压将是初级线圈的两倍。

If the secondary coil has more loops than the primary coil, so that it increases the voltage, that's called a step-up transformer.

如果次级线圈的回路比初级线圈多，从而增加电压，则称为升压变压器。

We can write this out as an equation for each coil separately, using a subscript P for the primary coil and a subscript S for the secondary coil.

我们可以将其分别写为每个线圈的方程式，使用下标 P 代表初级线圈，下标 S 代表次级线圈。

The voltage in the secondary coil divided by the voltage in the primary coil is equal to the number of loops in the secondary coil divided by the number of loops in the primary coil.

次级线圈中的电压除以初级线圈中的电压等于次级线圈中的回路数除以线圈数 初级线圈中的回路。