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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 current caused by an extra current path 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 resistance and opens the circuit.  
  2.What happens when an electric switch is turned off?  
  a.   The circuit becomes a series circuit.  
  b.   A circuit breaker turns off.  
  c.   The circuit is broken.  
  d.   There is a short circuit.  
  3.Current is measured by a(n) __________.  
  a.   ohmmeter  
  b.   electrometer  
  c.   ammeter  
  d.   voltmeter  
  4.Electrical wiring in homes uses __________ circuits.  
  a.   series  
  b.   voltage  
  c.   overloaded  
  d.   parallel  
  5.Voltmeters must have __________.  
  a.   very high voltage  
  b.   very high resistance  
  c.   very high currents  
  d.   very low resistance  
  6.A 340- resistor and a 550- reisistor are connected in parallel. This group is then connected in series with a 180- and a 120- resistor. What is the equivalent resistance of the circuit?  
  a.   210  
  b.   550  
  c.   510  
  d.   420  
  7.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   2.0 A  
  b.   0.50 A  
  c.   4.5 A  
  d.   3.0 A  
  8.What is the equation to find current in a series of three resistors?  
  a.   I = V(R1 × R2 × R3)  
  b.   I = V(R1 + R2 + R3)  
  c.   I = V/(R1 + R2 + R3)  
  d.   I = V/(R1 × R2 × R3)  
  9.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   voltage  
  b.   current  
  c.   path  
  d.   power  
  10.The __________ is the sum of all resistances in a series.  
  a.   equivalent resistance  
  b.   resistance total  
  c.   calculated resistance  
  d.   resistance  

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