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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 exactly twice the voltage of a lower-voltage battery  
  c.   to produce exactly half the voltage of a higher-voltage battery  
  d.   to produce a higher voltage from a lower-voltage battery  
  Hint    
      
  2.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    
      
  3.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   current  
  b.   path  
  c.   power  
  d.   voltage  
  Hint    
      
  4.The __________ is the sum of all resistances in a series.  
  a.   resistance  
  b.   calculated resistance  
  c.   resistance total  
  d.   equivalent resistance  
  Hint    
      
  5.Electrical wiring in homes uses __________ circuits.  
  a.   voltage  
  b.   overloaded  
  c.   series  
  d.   parallel  
  Hint    
      
  6.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.   18.7 V  
  c.   30.0 V  
  d.   13.3 V  
  Hint    
      
  7.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.   90 V  
  b.   2 V  
  c.   60 V  
  d.   30 V  
  Hint    
      
  8.Five lights of equal resistance connected in series will __________.  
  a.   flicker  
  b.   never light up  
  c.   be brighter the closer they get to the positive end  
  d.   be equally bright  
  Hint    
      
  9.A voltmeter should be connected to a circuit in __________.  
  a.   parallel  
  b.   series  
  c.   short form  
  d.   series-parallel  
  Hint    
      
  10.Why must an ammeter have an extremely low resistance?  
  a.   High resistance reduces risk of fire.  
  b.   High resistance changes the voltage reading.  
  c.   High resistance ensures there are fewer ohms.  
  d.   High resistance will change the current in the circuit you want to measure.  
  Hint    

 
   
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