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Chapter 23: Series and Parallel Circuits

Practice Test
  1.Electrical wiring in homes uses __________ circuits.  
  a.   overloaded  
  b.   voltage  
  c.   series  
  d.   parallel  
  2.A 45- and a 65- resistor are connected in series. These resistors are then connected in parallel with a 120- resistor. What is the equivalent resistance for the circuit?  
  a.   230  
  b.   150  
  c.   57  
  d.   22  
  3.What causes a fuse to blow?  
  a.   too high a current  
  b.   too low a resistance  
  c.   too high a voltage  
  d.   too much resistance  
  4.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   parallel  
  c.   series-parallel  
  d.   series  
  5.What happens to lights in a series if one goes out?  
  a.   they stay lit  
  b.   every other one goes out  
  c.   they all go out  
  d.   they flicker  
  6.How does a ground-fault interrupter work?  
  a.   It detects small differences in current caused by an extra current path and opens the circuit.  
  b.   It detects small differences in voltage caused by an extra voltage path and opens the circuit.  
  c.   It detects small differences in resistance and opens the circuit.  
  d.   It detects small differences in temperatures and opens the circuit.  
  7.Voltmeters must have __________.  
  a.   very high currents  
  b.   very low resistance  
  c.   very high resistance  
  d.   very high voltage  
  8.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   30  
  b.   2  
  c.   90  
  d.   20  
  9.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.   210  
  c.   420  
  d.   550  
  10.Five lights of equal resistance connected in series will __________.  
  a.   be equally bright  
  b.   be brighter the closer they get to the positive end  
  c.   flicker  
  d.   never light up  

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