Name_______________________________
Date__________________Period________
To the right is a key to the symbols you’ll see in some of the following questions. Unless otherwise stated, assume the internal resistance of the battery is negligible.
Open
Closed
Batteries Light Bulbs Resistor
1.
Consider the circuit to the right. Between which two points will the potential
3
Switches
4 difference be highest? Lowest? Explain your answers.
5
2.
Consider the circuit to the right. When the switch is closed, will the potential difference between points 1 and 2 increase, decrease or remain the same? Explain
1
A
2 your answer.
1
B
2
3.
Consider the circuit to the left. What is the potential difference between points A and B while the switch is open? Explain your answer.
A
B
12 V
4.
In the circuit above, what will happen to the pressure in the middle wire when the switch is closed? Explain your answer.

Show ALL work in the problems that follow, using new given and finds, general equations, etc. for each part if necessary. Don’t even think about cramming all that work on this sheet of paper.
5.
A circuit contains two resistors in parallel with a 12V battery. One branch has a resistance of 2 Ω . The other has a resistance of 8 Ω . a. Draw a circuit diagram. b. Find the total resistance of the circuit (find Req) c. Find the total current in the circuit d. Find the current in each branch of the circuit.
6.
Examine the circuit to the right. a. Describe the circuit in words b. Find the equivalent resistance of the two resistors in parallel c. Find the equivalent resistance of all three resistors (the total resistance in the circuit) d. The ammeter in the circuit reads 0.2A. What is the pressure difference across the equivalent resistance?
A
20
Ω
15
Ω
30
Ω e. What is the potential difference across the battery? f. What is the current through the 20 Ω resistor? g. What is the potential difference across the 20 Ω resistor? h. What is the potential difference across the 15 Ω resistor? k. What is the current through the 30 Ω resistor?
7.
For the circuit shown to the right: a.
Find the equivalent resistance of the two resistors in series. b.
Find the total equivalent resistance of the circuit. c.
Find the current through the battery. d.
What is the potential difference across the 10 Ω resistor? e.
What is the current through the 10 Ω resistor? f.
What is the current through the 4 Ω resistor? g.
What is the current through the 6 Ω resistor? h.
What is the potential difference across the 4 Ω resistor? i.
What is the potential difference across the 6 Ω resistor?
20
V
8.
Find the potential difference across and current through each resistor in the circuit shown to the right. i. What is the current through the 15 Ω resistor? j. What is the potential difference across the 30 Ω resistor?
10
Ω
4 Ω
A
4
Ω
7 Ω
B
2 Ω
6
Ω
9 V
C
5 Ω
D

9.
Find the equivalent resistance of the circuit shown to the right between points a and b. If you were to place a 10 V battery between points a and b, what current would flow from the battery
10.
Determine the equivalent resistance of the circuit shown above between the points A and B. How large a battery
A
2 Ω 2 Ω would you need to place between point A and B in order for
2.00 A to flow from it?
6 Ω
4 Ω
B
11.
Find the equivalent resistance for the circuit to the right. Determine the current that flows from the battery.
2 Ω
12 Ω
2 Ω
4 Ω
6 Ω
3 Ω
4 Ω
4 µF
2 Ω
12 V
5 Ω