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Chapter 23: Series and Parallel Circuits

Practice Test
  1.Electrical wiring in homes uses __________ circuits.  
  a.   voltage  
  b.   parallel  
  c.   series  
  d.   overloaded  
  2.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.   57  
  b.   230  
  c.   22  
  d.   150  
  3.Voltmeters must have __________.  
  a.   very high resistance  
  b.   very high voltage  
  c.   very low resistance  
  d.   very high currents  
  4.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.   30 V  
  c.   2 V  
  d.   60 V  
  5.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   30  
  b.   2  
  c.   90  
  d.   20  
  6.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 x 1/RB x 1/RC  
  d.   1/R = 1/RA + 1/RB + 1/RC  
  7.What is the purpose of a voltage divider?  
  a.   to produce a lower voltage from a higher-voltage battery  
  b.   to produce exactly twice the voltage of a lower-voltage battery  
  c.   to produce exactly half the voltage of a higher-voltage battery  
  d.   to produce a higher voltage from a lower-voltage battery  
  8.Why must an ammeter have an extremely low resistance?  
  a.   High resistance ensures there are fewer ohms.  
  b.   High resistance reduces risk of fire.  
  c.   High resistance will change the current in the circuit you want to measure.  
  d.   High resistance changes the voltage reading.  
  9.A 20.0- and a 40.0- resistor are connected in series to a 20.0-V battery. What is the voltage drop across the 40.0- resistor?  
  a.   13.3 V  
  b.   30.0 V  
  c.   6.70 V  
  d.   18.7 V  
  10.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   voltage  
  b.   path  
  c.   current  
  d.   power  

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