A BATTERY OF CELLS 



287. A Battery of Cells. The electromotive force of one 

 cell may not give a current strong enough to ring a door bell 

 or to operate a telephone. 

 But by using a number of 

 cells, called a battery, the 

 current may be increased 

 to almost any desired 

 strength. If three cells are 

 arranged as in Figure 200, 

 so that the copper of one 

 cell is connected with the 



zinc of another cell, the electromotive force of the battery will 

 be three times as great as the E. M. F. of a single cell. If 

 four cells are arranged in the same way, the E. M. F. of the 

 battery is four times as great as the E. M. F. of a single cell; 

 when five cells are combined, the resulting E. M. F. is five 

 times as great. 



FIG. 200. A battery of three cells. 



