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Chapter 23: Series and Parallel Circuits

Practice Test
  1.How does a ground-fault interrupter work?  
  a.   It detects small differences in temperatures and opens the circuit.  
  b.   It detects small differences in current caused by an extra current path and opens the circuit.  
  c.   It detects small differences in voltage caused by an extra voltage path and opens the circuit.  
  d.   It detects small differences in resistance and opens the circuit.  
  2.What happens to lights in a series if one goes out?  
  a.   they all go out  
  b.   they stay lit  
  c.   every other one goes out  
  d.   they flicker  
  3.What is the purpose of a voltage divider?  
  a.   to produce exactly half the voltage of a higher-voltage battery  
  b.   to produce a higher voltage from a lower-voltage battery  
  c.   to produce a lower voltage from a higher-voltage battery  
  d.   to produce exactly twice the voltage of a lower-voltage battery  
  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.   3.0 A  
  b.   2.0 A  
  c.   0.50 A  
  d.   4.5 A  
  5.A voltmeter should be connected to a circuit in __________.  
  a.   series  
  b.   series-parallel  
  c.   parallel  
  d.   short form  
  6.If you have two lights in parallel and you add another identical light in parallel, what happens to the total current?  
  a.   it decreases  
  b.   it increases  
  c.   it remains the same  
  d.   it goes to zero  
  7.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   90  
  b.   30  
  c.   20  
  d.   2  
  8.The __________ is the sum of all resistances in a series.  
  a.   resistance  
  b.   calculated resistance  
  c.   equivalent resistance  
  d.   resistance total  
  9.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.  
  10.Why must an ammeter have an extremely low resistance?  
  a.   High resistance changes the voltage reading.  
  b.   High resistance ensures there are fewer ohms.  
  c.   High resistance will change the current in the circuit you want to measure.  
  d.   High resistance reduces risk of fire.  

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