228 ELECTRICAL MACHINERY 



The drop across the inductance 







= 2x;LJ= 37.7X0. IX 55 = 2073 volts. 

 Across the condenser 



Across the resistance 



55X2 = 110 volts. 



Danger of the Resonant Condition. Thus it is seen that 

 in a resonant circuit having a low resistance enormous 

 voltages may build up across parts of the circuit; the voltage 

 across one part L of the circuit may be many times greater 

 than the voltage impressed on the whole circuit. 



This condition of resonance does not occur very fre- 

 quently in practice as the frequencies in common use are 

 too low to give resonant circuits with ordinary inductances 

 and capacities. It does, however, sometimes occur and 

 then line insulators, transformer windings, etc. are broken 

 down due to the high voltages set up in different parts of 

 the circuit. 



