There is another way of connecting batteries, and that is to obtain a larger number of ampères. This is called connecting in multiple arc, or for quantity.
Fig. 33
Let us take again for an illustration the three cells giving each 2 volts and 10 ampères. This time we connect the carbon of the first to the carbon of the second, and the carbon of the second to that of the third; then we connect the zinc of the first to that of the second, and the zinc of the second to that of the third, as shown in the sketch. (Fig. 33.)
We then attach a wire to the zinc and one to the carbon in the third cell, and we then can obtain from these two wires only 2 volts, but 30 ampères.
There are, again, many ways of connecting several of these sets together, but it is not intended in this book to go into these at length, for the reason that we only set out to give a simple explanation of the first principles of this subject.
We shall therefore only give an illustration of one more method of connecting batteries which will be easy to understand. This is called
MULTIPLE SERIES
The sketch we have last given shows three batteries connected in multiple. These we will call set No. 1.
Now, suppose we take three more batteries exactly similar and connect them together just in the same manner. Let us call this set No. 2. Now take the wire leading from the carbon of set No. 2 and connect it with the wire leading from the zinc of set No. 1. Then take a wire leading from the zinc of set No. 2, and a wire leading from the carbon of set No. 1, and connect them with the lamps or motors. These two sets being connected in multiple series, we shall get 4 volts and 30 ampères.