HOW TO JOIN CELLS FOR USE IN THE HOME 365 



tanks of water at the same pressure, and connect them so 

 as to get a water column three times as deep as that of a 

 single tank. The water pressure will be three times that 

 of a single tank. If we join three cells in series, that is, 

 zinc to carbon, and connect a voltmeter in the circuit, 

 we shall find three times as much pressure recorded as when 



Water Xante Aeries 

 Pressure \$ Increases 



WaterTahksiix'Parallel .'Pressure ofOneTank 



Water analogy to illustrate joining cells in series and in parallel. 



a single cell is attached to the voltmeter. A high pressure 

 (high voltage) will give us a larger current (in amperes) 

 through the bell, motor, or light than we can get from the 

 low pressure. When long wires are used in connecting 

 an electric bell greater voltage is required to overcome the 

 resistance of the long wire. This increased volta'ge can be 

 obtained by putting in one or two more cells joined in series. 

 A bell can be made to ring louder and a motor to run 

 faster by this same method. 



