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Chapter 23: Series and Parallel Circuits

Practice Test
      
  1.Voltmeters must have __________.  
  a.   very high voltage  
  b.   very high currents  
  c.   very low resistance  
  d.   very high resistance  
  Hint    
      
  2.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   R = 1/RA + 1/RB + 1/RC  
  b.   R = RA + RB + RC  
  c.   1/R = 1/RA x 1/RB x 1/RC  
  d.   1/R = 1/RA + 1/RB + 1/RC  
  Hint    
      
  3.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    
      
  4.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   0.50 A  
  b.   2.0 A  
  c.   3.0 A  
  d.   4.5 A  
  Hint    
      
  5.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   30  
  b.   90  
  c.   20  
  d.   2  
  Hint    
      
  6.The __________ is the sum of all resistances in a series.  
  a.   calculated resistance  
  b.   equivalent resistance  
  c.   resistance total  
  d.   resistance  
  Hint    
      
  7.What happens when an electric switch is turned off?  
  a.   A circuit breaker turns off.  
  b.   The circuit becomes a series circuit.  
  c.   The circuit is broken.  
  d.   There is a short circuit.  
  Hint    
      
  8.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.   0.0125 A  
  b.   0.0250 A  
  c.   0.100 A  
  d.   0.0500 A  
  Hint    
      
  9.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.   18.7 V  
  b.   6.70 V  
  c.   30.0 V  
  d.   13.3 V  
  Hint    
      
  10.A voltmeter should be connected to a circuit in __________.  
  a.   series  
  b.   series-parallel  
  c.   short form  
  d.   parallel  
  Hint    

 
   
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