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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.What is the purpose of a voltage divider?  
  a.   to produce exactly half the voltage of a higher-voltage battery  
  b.   to produce a lower voltage from a higher-voltage battery  
  c.   to produce a higher voltage from a lower-voltage battery  
  d.   to produce exactly twice the voltage of a lower-voltage battery  
  Hint    
      
  2.What is the equation to find current in a series of three resistors?  
  a.   I = V(R1 + R2 + R3)  
  b.   I = V(R1 × R2 × R3)  
  c.   I = V/(R1 × R2 × R3)  
  d.   I = V/(R1 + R2 + R3)  
  Hint    
      
  3.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 remains the same  
  c.   it goes to zero  
  d.   it increases  
  Hint    
      
  4.What causes a fuse to blow?  
  a.   too high a current  
  b.   too much resistance  
  c.   too low a resistance  
  d.   too high a voltage  
  Hint    
      
  5.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.   0.0125 A  
  b.   0.0500 A  
  c.   0.0250 A  
  d.   0.100 A  
  Hint    
      
  6.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   1/R = 1/RA x 1/RB x 1/RC  
  b.   R = 1/RA + 1/RB + 1/RC  
  c.   1/R = 1/RA + 1/RB + 1/RC  
  d.   R = RA + RB + RC  
  Hint    
      
  7.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   path  
  b.   voltage  
  c.   power  
  d.   current  
  Hint    
      
  8.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   3.0 A  
  b.   2.0 A  
  c.   4.5 A  
  d.   0.50 A  
  Hint    
      
  9.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   parallel  
  c.   series-parallel  
  d.   series  
  Hint    
      
  10.What happens to lights in a series if one goes out?  
  a.   they all go out  
  b.   they flicker  
  c.   every other one goes out  
  d.   they stay lit  
  Hint    

 
   
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