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Chapter 23: Series and Parallel Circuits

Practice Test
  1.Five lights of equal resistance connected in series will __________.  
  a.   never light up  
  b.   be equally bright  
  c.   flicker  
  d.   be brighter the closer they get to the positive end  
  2.Electrical wiring in homes uses __________ circuits.  
  a.   parallel  
  b.   series  
  c.   voltage  
  d.   overloaded  
  3.Why must an ammeter have an extremely low resistance?  
  a.   High resistance ensures there are fewer ohms.  
  b.   High resistance changes the voltage reading.  
  c.   High resistance reduces risk of fire.  
  d.   High resistance will change the current in the circuit you want to measure.  
  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.   4.5 A  
  d.   0.50 A  
  5.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   path  
  b.   current  
  c.   power  
  d.   voltage  
  6.How does a ground-fault interrupter work?  
  a.   It detects small differences in resistance 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 temperatures and opens the circuit.  
  d.   It detects small differences in current caused by an extra current path and opens the circuit.  
  7.The __________ is the sum of all resistances in a series.  
  a.   resistance total  
  b.   resistance  
  c.   calculated resistance  
  d.   equivalent resistance  
  8.A voltmeter should be connected to a circuit in __________.  
  a.   series-parallel  
  b.   short form  
  c.   parallel  
  d.   series  
  9.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   30  
  b.   2  
  c.   20  
  d.   90  
  10.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.   6.70 V  
  b.   18.7 V  
  c.   30.0 V  
  d.   13.3 V  

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