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Parallel Circuits
Multiple Choice

Choose the best response to complete the sentence or answer the question. You will need symbol font on your computer to see the omega.gif symbol for ohm.

1 .       When a 1.6 komega.gif resistor and a 120 omega.gif resistor are connected in parallel, the total resistance is [Hint]

 
 
 
 


2 .       A 470 omega.gif resistor, a 220 omega.gif resistor, and a 100 omega.gif resistor are all in parallel. The total resistance is approximately [Hint]

 
 
 
 


3 .       Six resistors are in parallel. The two lowest-value resistors are both 1.2 komega.gif. The total resistance [Hint]

 
 
 
 


4 .       When an additional resistor is connected across an existing parallel circuit, the total resistance [Hint]

 
 
 
 


5 .       If one of the resistors in a parallel circuit is removed, the total resistance [Hint]

 
 
 
 


6 .       The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is [Hint]

 
 
 
 


7 .       The following resistors are in parallel across a voltage source: 220 omega.gif, 470 omega.gif, and 560 omega.gif. The resistor with the least current is [Hint]

 
 
 
 


8 .       A sudden increase in the total current into a parallel circuit may indicate [Hint]

 
 
 
 


9 .       In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is [Hint]

 
 
 
 


10 .       In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 had 25 mA through it. After measuring a total of 27 mA, you can say that [Hint]

 
 
 
 


11 .       If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is [Hint]

 
 
 
 


12 .       The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is [Hint]

 
 
 
 


13 .       Three lights are connected in a parallel across a 120 volt source. If one light burns out, [Hint]

 
 
 
 


14 .       Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 omega.gif, the current through each parallel resistor is [Hint]

 
 
 
 


15 .       The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is [Hint]

 
 
 
 


16 .       There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is [Hint]

 
 
 
 


17 .       The total resistance of a parallel circuit is 50 omega.gif. If the total current is 120 mA, the current through the 270 omega.gif resistor that makes up part of the parallel circuit is approximately [Hint]

 
 
 
 


18 .       Five 100 omega.gif resistors are connected in parallel. If one resistor is removed, the total resistance is [Hint]

 
 
 
 


19 .       Three 47 omega.gif resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately [Hint]

 
 
 
 


20 .       Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is [Hint]

 
 
 
 


21 .       A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 komega.gif. The current through each bulb is approximately [Hint]

 
 
 
 


22 .       Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is [Hint]

 
 
 
 


23 .       An ammeter has an internal resistance of 50 omega.gif. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately [Hint]

 
 
 
 


24 .       Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately [Hint]

 
 
 
 


25 .       Four 8 omega.gif speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers [Hint]

 
 
 
 






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