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Chapter 23: Series and Parallel Circuits

Practice Test
  1.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  
  2.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.   60 V  
  d.   90 V  
  3.If you have two lights in parallel and you add another identical light in parallel, what happens to the total current?  
  a.   it increases  
  b.   it decreases  
  c.   it remains the same  
  d.   it goes to zero  
  4.Two 240.0- resistors are connected in parallel and placed across a 12.0-V battery. What is the current in each branch of the circuit?  
  a.   0.100 A  
  b.   0.0250 A  
  c.   0.0500 A  
  d.   0.0125 A  
  5.What happens to lights in a series if one goes out?  
  a.   every other one goes out  
  b.   they all go out  
  c.   they flicker  
  d.   they stay lit  
  6.What is the purpose of a voltage divider?  
  a.   to produce a lower voltage from a higher-voltage battery  
  b.   to produce exactly half the voltage of a higher-voltage battery  
  c.   to produce a higher voltage from a lower-voltage battery  
  d.   to produce exactly twice the voltage of a lower-voltage battery  
  7.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   1/R = 1/RA + 1/RB + 1/RC  
  b.   1/R = 1/RA x 1/RB x 1/RC  
  c.   R = RA + RB + RC  
  d.   R = 1/RA + 1/RB + 1/RC  
  8.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  
  9.Current is measured by a(n) __________.  
  a.   ammeter  
  b.   ohmmeter  
  c.   voltmeter  
  d.   electrometer  
  10.How does a ground-fault interrupter work?  
  a.   It detects small differences in temperatures 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 resistance and opens the circuit.  
  d.   It detects small differences in current caused by an extra current path and opens the circuit.  

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