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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   90  
  b.   2  
  c.   30  
  d.   20  
  Hint    
      
  2.What happens when an electric switch is turned off?  
  a.   The circuit is broken.  
  b.   There is a short circuit.  
  c.   A circuit breaker turns off.  
  d.   The circuit becomes a series circuit.  
  Hint    
      
  3.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    
      
  4.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   series-parallel  
  c.   series  
  d.   parallel  
  Hint    
      
  5.Current is measured by a(n) __________.  
  a.   electrometer  
  b.   ammeter  
  c.   ohmmeter  
  d.   voltmeter  
  Hint    
      
  6.Electrical wiring in homes uses __________ circuits.  
  a.   series  
  b.   overloaded  
  c.   parallel  
  d.   voltage  
  Hint    
      
  7.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 increases  
  c.   it remains the same  
  d.   it goes to zero  
  Hint    
      
  8.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 ensures there are fewer ohms.  
  d.   High resistance changes the voltage reading.  
  Hint    
      
  9.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 voltage.  
  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 current.  
  Hint    
      
  10.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.   420  
  b.   210  
  c.   550  
  d.   510  
  Hint    

 
   
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