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Chapter 23: Series and Parallel Circuits

Practice Test
  1.What causes a fuse to blow?  
  a.   too much resistance  
  b.   too low a resistance  
  c.   too high a current  
  d.   too high a voltage  
  2.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker is less sophisticated.  
  b.   A circuit breaker can be used mutliple times.  
  c.   A circuit breaker causes fires.  
  d.   A circuit breaker does not detect current.  
  3.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.   22  
  b.   230  
  c.   150  
  d.   57  
  4.What happens to lights in a series if one goes out?  
  a.   every other one goes out  
  b.   they stay lit  
  c.   they flicker  
  d.   they all go out  
  5.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 resistance and opens the circuit.  
  d.   It detects small differences in current caused by an extra current path and opens the circuit.  
  6.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.   path  
  d.   power  
  7.What happens when an electric switch is turned off?  
  a.   There is a short circuit.  
  b.   A circuit breaker turns off.  
  c.   The circuit is broken.  
  d.   The circuit becomes a series circuit.  
  8.Five lights of equal resistance connected in series will __________.  
  a.   flicker  
  b.   be equally bright  
  c.   never light up  
  d.   be brighter the closer they get to the positive end  
  9.A voltmeter should be connected to a circuit in __________.  
  a.   parallel  
  b.   short form  
  c.   series-parallel  
  d.   series  
  10.The __________ is the sum of all resistances in a series.  
  a.   resistance  
  b.   resistance total  
  c.   calculated resistance  
  d.   equivalent resistance  

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