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Chapter 23: Series and Parallel Circuits

Practice Test
  1.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)  
  2.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   2  
  b.   30  
  c.   20  
  d.   90  
  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.   90 V  
  d.   60 V  
  4.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  
  5.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.   510  
  c.   420  
  d.   550  
  6.Voltmeters must have __________.  
  a.   very high voltage  
  b.   very high currents  
  c.   very high resistance  
  d.   very low resistance  
  7.What causes a fuse to blow?  
  a.   too low a resistance  
  b.   too much resistance  
  c.   too high a voltage  
  d.   too high a current  
  8.Electrical wiring in homes uses __________ circuits.  
  a.   overloaded  
  b.   parallel  
  c.   series  
  d.   voltage  
  9.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.  
  10.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   series  
  c.   parallel  
  d.   series-parallel  

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