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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.   1/R = 1/RA + 1/RB + 1/RC  
  b.   R = 1/RA + 1/RB + 1/RC  
  c.   R = RA + RB + RC  
  d.   1/R = 1/RA x 1/RB x 1/RC  
  2.What happens when an electric switch is turned off?  
  a.   There is a short circuit.  
  b.   A circuit breaker turns off.  
  c.   The circuit becomes a series circuit.  
  d.   The circuit is broken.  
  3.If you have a 90 V power source with a 30- and 60- resistor in series, what is the voltage drop over the 60- resistor?  
  a.   30 V  
  b.   2 V  
  c.   60 V  
  d.   90 V  
  4.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.   150  
  c.   230  
  d.   57  
  5.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.   0.0500 A  
  c.   0.0250 A  
  d.   0.0125 A  
  6.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.  
  7.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.   18.7 V  
  b.   13.3 V  
  c.   6.70 V  
  d.   30.0 V  
  8.Electrical wiring in homes uses __________ circuits.  
  a.   overloaded  
  b.   voltage  
  c.   series  
  d.   parallel  
  9.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.  
  10.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   90  
  b.   20  
  c.   30  
  d.   2  

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