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Chapter 23: Series and Parallel Circuits

Practice Test
  1.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   current  
  b.   voltage  
  c.   power  
  d.   path  
  2.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 increases  
  c.   it remains the same  
  d.   it decreases  
  3.Voltmeters must have __________.  
  a.   very high currents  
  b.   very high voltage  
  c.   very low resistance  
  d.   very high resistance  
  4.What causes a fuse to blow?  
  a.   too much resistance  
  b.   too high a voltage  
  c.   too low a resistance  
  d.   too high a current  
  5.The __________ is the sum of all resistances in a series.  
  a.   resistance  
  b.   resistance total  
  c.   calculated resistance  
  d.   equivalent resistance  
  6.How does a ground-fault interrupter work?  
  a.   It detects small differences in voltage caused by an extra voltage path and opens the circuit.  
  b.   It detects small differences in temperatures and opens the circuit.  
  c.   It detects small differences in current caused by an extra current path and opens the circuit.  
  d.   It detects small differences in resistance and opens the circuit.  
  7.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.   550  
  d.   420  
  8.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker can be used mutliple times.  
  b.   A circuit breaker is less sophisticated.  
  c.   A circuit breaker causes fires.  
  d.   A circuit breaker does not detect current.  
  9.Five lights of equal resistance connected in series will __________.  
  a.   never light up  
  b.   be equally bright  
  c.   be brighter the closer they get to the positive end  
  d.   flicker  
  10.What happens to lights in a series if one goes out?  
  a.   every other one goes out  
  b.   they flicker  
  c.   they all go out  
  d.   they stay lit  

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