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Chapter 23: Series and Parallel Circuits

Practice Test
  1.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   R = RA + RB + RC  
  b.   R = 1/RA + 1/RB + 1/RC  
  c.   1/R = 1/RA + 1/RB + 1/RC  
  d.   1/R = 1/RA x 1/RB x 1/RC  
  2.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   voltage  
  b.   path  
  c.   power  
  d.   current  
  3.What happens to lights in a series if one goes out?  
  a.   they flicker  
  b.   every other one goes out  
  c.   they all go out  
  d.   they stay lit  
  4.Two 240.0- resistors are connected in parallel and placed across a 12.0-V battery. What is the current in each branch of the circuit?  
  a.   0.100 A  
  b.   0.0125 A  
  c.   0.0250 A  
  d.   0.0500 A  
  5.Five lights of equal resistance connected in series will __________.  
  a.   be equally bright  
  b.   never light up  
  c.   be brighter the closer they get to the positive end  
  d.   flicker  
  6.Why must an ammeter have an extremely low resistance?  
  a.   High resistance reduces risk of fire.  
  b.   High resistance will change the current in the circuit you want to measure.  
  c.   High resistance ensures there are fewer ohms.  
  d.   High resistance changes the voltage reading.  
  7.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker can be used mutliple times.  
  b.   A circuit breaker does not detect current.  
  c.   A circuit breaker is less sophisticated.  
  d.   A circuit breaker causes fires.  
  8.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.   13.3 V  
  c.   30.0 V  
  d.   18.7 V  
  9.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   30  
  b.   90  
  c.   2  
  d.   20  
  10.Current is measured by a(n) __________.  
  a.   voltmeter  
  b.   ammeter  
  c.   electrometer  
  d.   ohmmeter  

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