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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 higher voltage from a lower-voltage battery  
  b.   to produce exactly twice the voltage of a lower-voltage battery  
  c.   to produce a lower voltage from a higher-voltage battery  
  d.   to produce exactly half the voltage of a higher-voltage battery  
  Hint    
      
  2.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.   210  
  b.   550  
  c.   420  
  d.   510  
  Hint    
      
  3.A voltmeter should be connected to a circuit in __________.  
  a.   series  
  b.   series-parallel  
  c.   short form  
  d.   parallel  
  Hint    
      
  4.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker causes fires.  
  b.   A circuit breaker can be used mutliple times.  
  c.   A circuit breaker is less sophisticated.  
  d.   A circuit breaker does not detect current.  
  Hint    
      
  5.The __________ is the sum of all resistances in a series.  
  a.   resistance total  
  b.   equivalent resistance  
  c.   resistance  
  d.   calculated resistance  
  Hint    
      
  6.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    
      
  7.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   2  
  b.   30  
  c.   20  
  d.   90  
  Hint    
      
  8.If you have two lights in parallel and you add another identical light in parallel, what happens to the total current?  
  a.   it goes to zero  
  b.   it remains the same  
  c.   it decreases  
  d.   it increases  
  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.   The voltage becomes too much for the circuit to handle.  
  c.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.  
  d.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.  
  Hint    
      
  10.Electrical wiring in homes uses __________ circuits.  
  a.   series  
  b.   overloaded  
  c.   parallel  
  d.   voltage  
  Hint    

 
   
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