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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   90  
  b.   20  
  c.   30  
  d.   2  
  Hint    
      
  2.If you have two lights in parallel and you add another identical light in parallel, what happens to the total current?  
  a.   it decreases  
  b.   it increases  
  c.   it goes to zero  
  d.   it remains the same  
  Hint    
      
  3.What causes a fuse to blow?  
  a.   too high a current  
  b.   too much resistance  
  c.   too high a voltage  
  d.   too low a resistance  
  Hint    
      
  4.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   2.0 A  
  b.   4.5 A  
  c.   3.0 A  
  d.   0.50 A  
  Hint    
      
  5.What happens to lights in a series if one goes out?  
  a.   every other one goes out  
  b.   they flicker  
  c.   they all go out  
  d.   they stay lit  
  Hint    
      
  6.What happens when an electric switch is turned off?  
  a.   There is a short circuit.  
  b.   A circuit breaker turns off.  
  c.   The circuit is broken.  
  d.   The circuit becomes a series circuit.  
  Hint    
      
  7.Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?  
  a.   The voltage becomes too much for the circuit to handle.  
  b.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.  
  c.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.  
  d.   The current drops to almost zero.  
  Hint    
      
  8.How does a ground-fault interrupter work?  
  a.   It detects small differences in resistance and opens the circuit.  
  b.   It detects small differences in current caused by an extra current path 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 temperatures and opens the circuit.  
  Hint    
      
  9.A 45- and a 65- resistor are connected in series. These resistors are then connected in parallel with a 120- resistor. What is the equivalent resistance for the circuit?  
  a.   57  
  b.   22  
  c.   150  
  d.   230  
  Hint    
      
  10.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   1/R = 1/RA + 1/RB + 1/RC  
  b.   1/R = 1/RA x 1/RB x 1/RC  
  c.   R = 1/RA + 1/RB + 1/RC  
  d.   R = RA + RB + RC  
  Hint    

 
   
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