498 



FARM MOTORS 



668. Transformers. Where alternating currents are 

 used for electric lighting, to make the cost of transmission 

 a minimum a voltage of 1,100 to 2,200 or even higher is 

 used ; this is far too high to be taken into houses and so a 

 transformer is connected into the circuit. A transformer 

 is identical with the induction coil with the automatic 

 circuit breaker removed. A transformer, however, usually 

 decreases the E.M.F. instead of increasing it. This is 

 done by having the primary enter the coil on a large num- 

 ber of turns and the secondary pass off on a few turns. 

 Since the current is alternating in action, it takes the 

 place of a circuit breaker. 



669. Copper wire table. 



