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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.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.   90 V  
  d.   30 V  
  Hint    
      
  2.A voltmeter should be connected to a circuit in __________.  
  a.   series-parallel  
  b.   short form  
  c.   series  
  d.   parallel  
  Hint    
      
  3.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    
      
  4.What causes a fuse to blow?  
  a.   too low a resistance  
  b.   too high a current  
  c.   too high a voltage  
  d.   too much resistance  
  Hint    
      
  5.Five lights of equal resistance connected in series will __________.  
  a.   flicker  
  b.   be equally bright  
  c.   be brighter the closer they get to the positive end  
  d.   never light up  
  Hint    
      
  6.Current is measured by a(n) __________.  
  a.   ohmmeter  
  b.   ammeter  
  c.   electrometer  
  d.   voltmeter  
  Hint    
      
  7.How does a ground-fault interrupter work?  
  a.   It detects small differences in temperatures 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 resistance and opens the circuit.  
  d.   It detects small differences in voltage caused by an extra voltage path and opens the circuit.  
  Hint    
      
  8.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   1/R = 1/RA x 1/RB x 1/RC  
  b.   R = RA + RB + RC  
  c.   R = 1/RA + 1/RB + 1/RC  
  d.   1/R = 1/RA + 1/RB + 1/RC  
  Hint    
      
  9.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   30  
  b.   20  
  c.   2  
  d.   90  
  Hint    
      
  10.What is the purpose of a voltage divider?  
  a.   to produce a higher voltage from a lower-voltage battery  
  b.   to produce a lower voltage from a higher-voltage battery  
  c.   to produce exactly twice the voltage of a lower-voltage battery  
  d.   to produce exactly half the voltage of a higher-voltage battery  
  Hint    

 
   
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