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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.What is the purpose of a voltage divider?  
  a.   to produce a lower voltage from a higher-voltage battery  
  b.   to produce a higher voltage from a lower-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    
      
  2.What happens to lights in a series if one goes out?  
  a.   they flicker  
  b.   every other one goes out  
  c.   they all go out  
  d.   they stay lit  
  Hint    
      
  3.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.   6.70 V  
  b.   30.0 V  
  c.   13.3 V  
  d.   18.7 V  
  Hint    
      
  4.Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?  
  a.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.  
  b.   The current drops to almost zero.  
  c.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.  
  d.   The voltage becomes too much for the circuit to handle.  
  Hint    
      
  5.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker does not detect current.  
  b.   A circuit breaker is less sophisticated.  
  c.   A circuit breaker causes fires.  
  d.   A circuit breaker can be used mutliple times.  
  Hint    
      
  6.Voltmeters must have __________.  
  a.   very high currents  
  b.   very high resistance  
  c.   very low resistance  
  d.   very high voltage  
  Hint    
      
  7.Why must an ammeter have an extremely low resistance?  
  a.   High resistance reduces risk of fire.  
  b.   High resistance will change the current in the circuit you want to measure.  
  c.   High resistance changes the voltage reading.  
  d.   High resistance ensures there are fewer ohms.  
  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.   1/R = 1/RA + 1/RB + 1/RC  
  c.   R = RA + RB + RC  
  d.   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.   2  
  c.   90  
  d.   20  
  Hint    
      
  10.Two 240.0- resistors are connected in parallel and placed across a 12.0-V battery. What is the current in each branch of the circuit?  
  a.   0.0250 A  
  b.   0.0500 A  
  c.   0.100 A  
  d.   0.0125 A  
  Hint    

 
   
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