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Chapter 23: Series and Parallel Circuits

Practice Test
  1.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.   current  
  d.   power  
  2.Why must an ammeter have an extremely low resistance?  
  a.   High resistance reduces risk of fire.  
  b.   High resistance changes the voltage reading.  
  c.   High resistance will change the current in the circuit you want to measure.  
  d.   High resistance ensures there are fewer ohms.  
  3.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker is less sophisticated.  
  b.   A circuit breaker does not detect current.  
  c.   A circuit breaker causes fires.  
  d.   A circuit breaker can be used mutliple times.  
  4.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  
  5.What happens to lights in a series if one goes out?  
  a.   they all go out  
  b.   they stay lit  
  c.   they flicker  
  d.   every other one goes out  
  6.The __________ is the sum of all resistances in a series.  
  a.   resistance  
  b.   equivalent resistance  
  c.   resistance total  
  d.   calculated resistance  
  7.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)  
  8.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 current caused by an extra current path and opens the circuit.  
  d.   It detects small differences in temperatures and opens the circuit.  
  9.A voltmeter should be connected to a circuit in __________.  
  a.   parallel  
  b.   series-parallel  
  c.   series  
  d.   short form  
  10.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.   150  
  b.   57  
  c.   22  
  d.   230  

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