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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 temperatures and opens the circuit.  
  b.   It detects small differences in resistance 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 voltage caused by an extra voltage path and opens the circuit.  
  2.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)  
  3.Why must an ammeter have an extremely low resistance?  
  a.   High resistance ensures there are fewer ohms.  
  b.   High resistance will change the current in the circuit you want to measure.  
  c.   High resistance reduces risk of fire.  
  d.   High resistance changes the voltage reading.  
  4.Electrical wiring in homes uses __________ circuits.  
  a.   voltage  
  b.   series  
  c.   parallel  
  d.   overloaded  
  5.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   90  
  b.   30  
  c.   2  
  d.   20  
  6.Five lights of equal resistance connected in series will __________.  
  a.   flicker  
  b.   be equally bright  
  c.   be brighter the closer they get to the positive end  
  d.   never light up  
  7.The __________ is the sum of all resistances in a series.  
  a.   resistance total  
  b.   calculated resistance  
  c.   equivalent resistance  
  d.   resistance  
  8.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.   60 V  
  b.   90 V  
  c.   2 V  
  d.   30 V  
  9.What causes a fuse to blow?  
  a.   too high a current  
  b.   too much resistance  
  c.   too low a resistance  
  d.   too high a voltage  
  10.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.   420  
  c.   510  
  d.   550  

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