"To be" and its functions. "To have" and its functions

II. Analyze the following sentences and translate them:

1. 
   An alternating current flows provided an alternating voltage source is applied to the circuit.
   
2. 
   Transformers are also used to step down the voltage at the receiving point of the line to the low values that are necessary for use.
   
3. 
   If the readings of an ammeter are observed simultaneously with the millivoltmeter readings, it is easy to calculate the corrections for current variations.
   
4. 
   There is a special kind of connection of a relay responsive to overload which has already been met with in the preceding chapter.
   
5. 
   Examining the network we see each relay is connected to similar secondary terminals of 2 current transformers.
   
6. 
   That the discovery of radioactivity has led to finding out the structure of the atom is quite evident.
   
7. 
   Very few of the robots we have talked about up to now have looked like men.
   
8. 
   As the ionospheric wave leaves the transmitting antenna, it starts traveling and reaches a region called the ionosphere.
   
9. 
   A computer is given a complete set of ready-made instructions on how to do given job.
   
10. 
    It was realized the atom must contain a tremendous amount of energy.
    
11. 
    The heat scientists calculated will be more than enough to heat a pound of water from freezing to boiling.
    
12. 
    If this signal controls a specific interval of time before an action takes place, the circuit is a time-delay circuit.
    
13. 
    The thyratron begins conducting each time the grid voltage exceeds the critical voltage.
    
14. 
    The point at which grid voltage exceeds the critical voltage occurs later.
    

This means electric power may be transmitted over considerable distances with negligible losses without the use of transmission lines.