Electricity 



211 



After charging for some time, disconnect the charging outfit 

 and then connect up the cell with a door bell. You can get a weak 

 current from it for a short time. Each time you charge it the 

 result becomes better and after a few chargings you are able to 

 obtain a strong current. 



CHARGING A STORAGE BATTERY 



It stores electrical energy as chemical energy. This chemical energy produces 

 in turn a powerful electric current. 



Unit Measures of Electricity. Just as we have the gallon 

 with which to measure the flow of water, and the pound with 

 which to measure its pressure, so we have standard units to 

 measure electricity. These measures are the ampere, the ohm, 

 the volt and the watt. 



The Ampere. The amount of electricity flowing through a 

 conductor per second is measured by the ampere. For example, 

 an ordinary electric bell requires a flow of T V amperes. Amount 

 of current is measured by an instrument called an ammeter 



