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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.How does a ground-fault interrupter work?  
  a.   It detects small differences in resistance and opens the circuit.  
  b.   It detects small differences in temperatures and opens the circuit.  
  c.   It detects small differences in voltage caused by an extra voltage path and opens the circuit.  
  d.   It detects small differences in current caused by an extra current path and opens the circuit.  
  Hint    
      
  2.What happens to lights in a series if one goes out?  
  a.   they all go out  
  b.   every other one goes out  
  c.   they flicker  
  d.   they stay lit  
  Hint    
      
  3.Five lights of equal resistance connected in series will __________.  
  a.   be equally bright  
  b.   never light up  
  c.   flicker  
  d.   be brighter the closer they get to the positive end  
  Hint    
      
  4.A 20.0- and a 40.0- resistor are connected in series to a 20.0-V battery. What is the voltage drop across the 40.0- resistor?  
  a.   13.3 V  
  b.   18.7 V  
  c.   30.0 V  
  d.   6.70 V  
  Hint    
      
  5.A 340- resistor and a 550- reisistor are connected in parallel. This group is then connected in series with a 180- and a 120- resistor. What is the equivalent resistance of the circuit?  
  a.   420  
  b.   210  
  c.   510  
  d.   550  
  Hint    
      
  6.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker can be used mutliple times.  
  b.   A circuit breaker does not detect current.  
  c.   A circuit breaker is less sophisticated.  
  d.   A circuit breaker causes fires.  
  Hint    
      
  7.If you have a 90 V power source with a 30- and 60- resistor in series, what is the voltage drop over the 60- resistor?  
  a.   60 V  
  b.   2 V  
  c.   30 V  
  d.   90 V  
  Hint    
      
  8.What causes a fuse to blow?  
  a.   too high a voltage  
  b.   too high a current  
  c.   too much resistance  
  d.   too low a resistance  
  Hint    
      
  9.Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?  
  a.   The current drops to almost zero.  
  b.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.  
  c.   The voltage becomes too much for the circuit to handle.  
  d.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.  
  Hint    
      
  10.What is the purpose of a voltage divider?  
  a.   to produce exactly twice the voltage of a lower-voltage battery  
  b.   to produce a lower voltage from a higher-voltage battery  
  c.   to produce exactly half the voltage of a higher-voltage battery  
  d.   to produce a higher voltage from a lower-voltage battery  
  Hint    

 
   
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