Name: 
 

Chapter 18 Review


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
If the potential difference across a pair of batteries used to power a flashlight is 6.0 V, what is the potential difference across the flashlight bulb?
a.
3.0 V
c.
9.0 V
b.
6.0 V
d.
12 V
 

 2. 
Three resistors connected in series carry currents labeled Imc002-1.jpg, Imc002-2.jpg, and Imc002-3.jpg, respectively. Which of the following expresses the total current, Imc002-4.jpg, in the system made up of the three resistors in series?
a.
It = I1 + I2 + I3
c.
It = I1 = I2 = I3
b.
It = mc002-5.jpg
d.
It = mc002-6.jpg
 

 3. 
Three resistors connected in series have potential differences across them labeled DVmc003-1.jpg, DVmc003-2.jpg, and DVmc003-3.jpg. Which of the following expresses the potential difference taken over the three resistors together?
a.
DVt = DV1 + DV2 + DV3
c.
DVt = DV1 = DV2 = DV3
b.
DVt = mc003-4.jpg
d.
DVt = mc003-5.jpg
 

 4. 
Three resistors with values of Rmc004-1.jpg, Rmc004-2.jpg, and Rmc004-3.jpg are connected in series. Which of the following expresses the total resistance, Rmc004-4.jpg, of the three resistors?
a.
Req = R1 + R2 + R3
c.
Req = R1 = R2 = R3
b.
Req = mc004-5.jpg
d.
Req = mc004-6.jpg
 

 5. 
A circuit is composed of resistors wired in series. What is the relationship between the equivalent resistance of the circuit and the resistance of the individual resistors?
a.
The equivalent resistance is equal to the largest resistance in the circuit.
b.
The equivalent resistance is greater than the sum of all the resistances in the circuit.
c.
The equivalent resistance is equal to the sum of the individual resistances.
d.
The equivalent resistance is less than the smallest resistance in the circuit.
 

 6. 
Three resistors with values of 3.0 W, 6.0 W, and 12 W are connected in series. What is the equivalent resistance of this combination?
a.
0.58 W
c.
7.0 W
b.
1.7 W
d.
21 W
 

 7. 
Three resistors connected in parallel carry currents labeled Imc007-1.jpg, Imc007-2.jpg, and Imc007-3.jpg. Which of the following expresses the total current Imc007-4.jpg in the combined system?
a.
It = I1 + I2 + I3
c.
It = I1 = I2 = I3
b.
It = mc007-5.jpg
d.
It = mc007-6.jpg
 

 8. 
Three resistors connected in parallel have potential differences across them labeled DVmc008-1.jpg, DVmc008-2.jpg, and DVmc008-3.jpg. Which of the following expresses the potential difference across all three resistors?
a.
DVt = DV1 + DV2 + DV3
c.
DVt = DV1 = DV2 = DV3
b.
DVt = mc008-4.jpg
d.
DVt = mc008-5.jpg
 

 9. 
Three resistors with values of Rmc009-1.jpg, Rmc009-2.jpg, and Rmc009-3.jpg are connected in parallel. Which of the following expresses the total resistance, Rmc009-4.jpg, of the three resistors?
a.
Req = R1 + R2 + R3
c.
Req = R1 = R2 = R3
b.
Req = mc009-5.jpg
d.
Req = mc009-6.jpg
 

 10. 
Three resistors with values of 3.0 W, 6.0 W, and 12 W are connected in parallel. What is the equivalent resistance of this combination?
a.
0.26 W
c.
9.0 W
b.
1.7 W
d.
21 W
 

 11. 
To find the current in a complex circuit, it is necessary to know the
a.
potential difference in each device in the circuit.
b.
current in each device in the circuit.
c.
equivalent resistance of the circuit.
d.
number of branches in the circuit.
 
 
nar001-1.jpg
 

 12. 
What is the equivalent resistance for the resistors in the figure shown above?
a.
1.3 W
c.
3.0 W
b.
2.2 W
d.
12.0 W
 
 
nar002-1.jpg
 

 13. 
Three resistors connected in parallel have individual values of 4.0 W, 6.0 W, and 10.0 W, as shown above. If this combination is connected in series with a 12.0 V battery and a 2.0 W resistor, what is the current in the 10.0 W resistor?
a.
0.58 A
c.
11 A
b.
1.0 A
d.
16 A
 

Short Answer
 

 14. 
How does the equivalent resistance of a series circuit compare to the resistance values of the individual resistances in the circuit?
 

 15. 
How does the equivalent resistance of a parallel circuit compare to the resistance values of the individual resistances in the circuit?
 

 16. 
You have only six resistors available, and all of the resistors have a value of 10.0 W. How would you connect these six resistors to produce an equivalent resistance of 12.0 W?
 

 17. 
You have seven resistors available, and all of the resistors have a value of 100.0 W. How would you connect these seven resistors to produce an equivalent resistance of 70.0 W?
 
 
nar003-1.jpg
 

 18. 
In the circuit shown above, which resistors, if any, have equal voltages across them?
 

Problem
 

 19. 
A current of 0.20 A passes through a 3.0 W resistor. The resistor is connected in series with a 6.0 V battery and an unknown resistor. What is the resistance value of the unknown resistor?
 

 20. 
Four resistors are wired in parallel with a 2.50 V battery. The total circuit current is 1.85 A, and three of the resistors have resistances of 2.70 W, 8.20 W, and 12.6 W. What is the resistance of the fourth resistor?
 
 
nar004-1.jpg
 

 21. 
How much current is in one of the 10 W resistors in the diagram shown above?
 
 
nar005-1.jpg
 

 22. 
In the circuit shown above, the current in the 3.9 W resistor is 0.27 A. What is the voltage of the battery?
 
 
nar006-1.jpg
 

 23. 
What is the current through the 8.20 W resistor in the circuit shown above?
 



 
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