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Chapter 23: Series and Parallel Circuits

Practice Test
  1.Electrical wiring in homes uses __________ circuits.  
  a.   series  
  b.   overloaded  
  c.   voltage  
  d.   parallel  
  2.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.   13.3 V  
  b.   18.7 V  
  c.   6.70 V  
  d.   30.0 V  
  3.What happens when an electric switch is turned off?  
  a.   A circuit breaker turns off.  
  b.   There is a short circuit.  
  c.   The circuit becomes a series circuit.  
  d.   The circuit is broken.  
  4.What is the purpose of a voltage divider?  
  a.   to produce a higher voltage from a lower-voltage battery  
  b.   to produce exactly twice the voltage of a lower-voltage battery  
  c.   to produce a lower voltage from a higher-voltage battery  
  d.   to produce exactly half the voltage of a higher-voltage battery  
  5.What causes a fuse to blow?  
  a.   too high a current  
  b.   too low a resistance  
  c.   too much resistance  
  d.   too high a voltage  
  6.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 decreases  
  d.   it remains the same  
  7.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   path  
  b.   power  
  c.   current  
  d.   voltage  
  8.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.  
  9.Why must an ammeter have an extremely low resistance?  
  a.   High resistance changes the voltage reading.  
  b.   High resistance will change the current in the circuit you want to measure.  
  c.   High resistance reduces risk of fire.  
  d.   High resistance ensures there are fewer ohms.  
  10.What happens to lights in a series if one goes out?  
  a.   they stay lit  
  b.   they all go out  
  c.   every other one goes out  
  d.   they flicker  

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