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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.What causes a fuse to blow?  
  a.   too low a resistance  
  b.   too much resistance  
  c.   too high a current  
  d.   too high a voltage  
  Hint    
      
  2.Why must an ammeter have an extremely low resistance?  
  a.   High resistance ensures there are fewer ohms.  
  b.   High resistance changes the voltage reading.  
  c.   High resistance reduces risk of fire.  
  d.   High resistance will change the current in the circuit you want to measure.  
  Hint    
      
  3.What happens when an electric switch is turned off?  
  a.   A circuit breaker turns off.  
  b.   The circuit becomes a series circuit.  
  c.   There is a short circuit.  
  d.   The circuit is broken.  
  Hint    
      
  4.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   2  
  b.   90  
  c.   20  
  d.   30  
  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.   0.100 A  
  b.   0.0250 A  
  c.   0.0500 A  
  d.   0.0125 A  
  Hint    
      
  6.Voltmeters must have __________.  
  a.   very low resistance  
  b.   very high resistance  
  c.   very high currents  
  d.   very high voltage  
  Hint    
      
  7.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   parallel  
  c.   series  
  d.   series-parallel  
  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 increases  
  d.   it decreases  
  Hint    
      
  9.Electrical wiring in homes uses __________ circuits.  
  a.   voltage  
  b.   parallel  
  c.   overloaded  
  d.   series  
  Hint    
      
  10.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.   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 voltage.  
  Hint    

 
   
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