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Chapter 23: Series and Parallel Circuits

Practice Test
  1.The equivalent resistance of resistors in parallel can be calculated by __________.  
  a.   1/R = 1/RA + 1/RB + 1/RC  
  b.   R = 1/RA + 1/RB + 1/RC  
  c.   R = RA + RB + RC  
  d.   1/R = 1/RA x 1/RB x 1/RC  
  2.The __________ is the sum of all resistances in a series.  
  a.   resistance total  
  b.   equivalent resistance  
  c.   resistance  
  d.   calculated resistance  
  3.What happens to lights in a series if one goes out?  
  a.   they stay lit  
  b.   every other one goes out  
  c.   they flicker  
  d.   they all go out  
  4.Five lights of equal resistance connected in series will __________.  
  a.   be equally bright  
  b.   never light up  
  c.   flicker  
  d.   be brighter the closer they get to the positive end  
  5.What is the purpose of a voltage divider?  
  a.   to produce exactly half the voltage of a higher-voltage battery  
  b.   to produce exactly twice the voltage of a lower-voltage battery  
  c.   to produce a higher voltage from a lower-voltage battery  
  d.   to produce a lower voltage from a higher-voltage battery  
  6.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.   22  
  b.   230  
  c.   150  
  d.   57  
  7.A voltmeter should be connected to a circuit in __________.  
  a.   short form  
  b.   series  
  c.   series-parallel  
  d.   parallel  
  8.What causes a fuse to blow?  
  a.   too high a current  
  b.   too high a voltage  
  c.   too low a resistance  
  d.   too much resistance  
  9.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)  
  10.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   4.5 A  
  b.   0.50 A  
  c.   2.0 A  
  d.   3.0 A  

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