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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   series  
  c.   series-parallel  
  d.   parallel  
  Hint    
      
  2.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   R = 1/RA + 1/RB + 1/RC  
  b.   1/R = 1/RA x 1/RB x 1/RC  
  c.   1/R = 1/RA + 1/RB + 1/RC  
  d.   R = RA + RB + RC  
  Hint    
      
  3.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   4.5 A  
  b.   2.0 A  
  c.   0.50 A  
  d.   3.0 A  
  Hint    
      
  4.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 decreases  
  c.   it remains the same  
  d.   it increases  
  Hint    
      
  5.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    
      
  6.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.   30 V  
  b.   60 V  
  c.   90 V  
  d.   2 V  
  Hint    
      
  7.Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?  
  a.   The voltage becomes too much for the circuit to handle.  
  b.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.  
  c.   As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.  
  d.   The current drops to almost zero.  
  Hint    
      
  8.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.   510  
  b.   550  
  c.   420  
  d.   210  
  Hint    
      
  9.What is the purpose of a voltage divider?  
  a.   to produce a higher voltage from a lower-voltage battery  
  b.   to produce a lower voltage from a higher-voltage battery  
  c.   to produce exactly half the voltage of a higher-voltage battery  
  d.   to produce exactly twice the voltage of a lower-voltage battery  
  Hint    
      
  10.What happens when an electric switch is turned off?  
  a.   The circuit becomes a series circuit.  
  b.   The circuit is broken.  
  c.   A circuit breaker turns off.  
  d.   There is a short circuit.  
  Hint    

 
   
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