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Chapter 23: Series and Parallel Circuits

Practice Test
  1.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   2  
  b.   20  
  c.   30  
  d.   90  
  2.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.   550  
  c.   510  
  d.   420  
  3.Five lights of equal resistance connected in series will __________.  
  a.   be brighter the closer they get to the positive end  
  b.   be equally bright  
  c.   never light up  
  d.   flicker  
  4.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)  
  5.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.   30.0 V  
  b.   13.3 V  
  c.   6.70 V  
  d.   18.7 V  
  6.What is the purpose of a voltage divider?  
  a.   to produce exactly half the voltage of a higher-voltage battery  
  b.   to produce a higher voltage from a lower-voltage battery  
  c.   to produce a lower voltage from a higher-voltage battery  
  d.   to produce exactly twice the voltage of a lower-voltage battery  
  7.What happens when an electric switch is turned off?  
  a.   The circuit is broken.  
  b.   A circuit breaker turns off.  
  c.   The circuit becomes a series circuit.  
  d.   There is a short circuit.  
  8.Why must an ammeter have an extremely low resistance?  
  a.   High resistance changes the voltage reading.  
  b.   High resistance will change the current in the circuit you want to measure.  
  c.   High resistance ensures there are fewer ohms.  
  d.   High resistance reduces risk of fire.  
  9.Voltmeters must have __________.  
  a.   very high voltage  
  b.   very high currents  
  c.   very high resistance  
  d.   very low resistance  
  10.In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.  
  a.   voltage  
  b.   power  
  c.   current  
  d.   path  

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