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Chapter 23: Series and Parallel Circuits

Practice Test
  1.Current is measured by a(n) __________.  
  a.   ohmmeter  
  b.   electrometer  
  c.   ammeter  
  d.   voltmeter  
  2.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.   510  
  b.   420  
  c.   210  
  d.   550  
  3.What happens to lights in a series if one goes out?  
  a.   every other one goes out  
  b.   they all go out  
  c.   they stay lit  
  d.   they flicker  
  4.How is a circuit breaker different from a fuse?  
  a.   A circuit breaker does not detect current.  
  b.   A circuit breaker causes fires.  
  c.   A circuit breaker is less sophisticated.  
  d.   A circuit breaker can be used mutliple times.  
  5.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.   90 V  
  b.   2 V  
  c.   30 V  
  d.   60 V  
  6.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)  
  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.   3.0 A  
  b.   4.5 A  
  c.   0.50 A  
  d.   2.0 A  
  8.Electrical wiring in homes uses __________ circuits.  
  a.   parallel  
  b.   overloaded  
  c.   voltage  
  d.   series  
  9.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.  
  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.   22  
  c.   57  
  d.   230  

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