Download Name Class Date Review for Electricity and Magnetism Test Units

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Class
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Review for Electricity and Magnetism Test
Units: Electrostatics, Electric Current, and Magnesitm

Make sure you review the objectives on each syllabi

Use your quizzes from Electrostatic and Electric Current to review some questions

Use the notes, lab, classroom/homeworks to review individual concepts.
ELECTROSTATICS:
1. You go to the playground and see a wonderful, super high, super twisted plastic slide. You
go to the top and start to slide down.
2. As you slide down the plastic slide (on a dry and cold winter day) you notice that your hair
is starting to stand up as if you were touching the Van De Graff generator. Explain in detail
why your hair is standing up.
3. You get to the bottom and touch a friend who is standing nearby BEFORE you put your feet
on the ground. You give your friend a giant shock. What is going on? Explain in detail.
4. You slide down the slide again but this time, when you get to the bottom, you let your feet
touch the ground before you try to shock your friend. Is the shock smaller, the same, or
bigger than it was the first time? Explain.
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Electricity: CHAPTER 20
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Drawing Charges:
+
5. Suppose we charge the block so it is
negative. Draw in electrons (using
negative signs, “–”) appropriately.
+
+
+
+
+
+
6. Draw in electrons to make the block
polarized by a negative charge on
the right, while the block remains
neutral.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
7. Electrophorus (“Electricity-for-us”): The pictures below show an electrophorus at four
stages in its charging. (Notice that the square base is negative in this example.)
A. Add “+” and “-“ signs to the drawings showing the charges on the pie plate at each
stage.
bef ore
aft er
to uching
to uching
– +– –
– +– –
– +– –
– +– –
B. What is the name for this type of charging?
8. Describe the three types of charging, and something important and unique about each of
them:
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Electricity: CHAPTER 20
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9. What is grounding?
10. How does the force on a pair of small charged objects depend upon their charges?
11. How does the force on a pair of small charged objects depend upon the distance
separating them?
12. What is the formula known as Coulomb’s Law? (Make sure you practice using Coulomb’s
Law if you feel rusty!)
13. Compare and contrast conductors and insulators.
ELECTRIC CURRENT & CIRCUITS:
______ 1. Safe electrical cords use
a. only conductors.
b. only insulators.
c. both conductors and insulators.
d. neither conductors nor insulators.
______2. Electric current can flow only through
a. a closed circuit.
b. an open circuit.
c. a parallel circuit.
d. a series circuit.
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Electricity: CHAPTER 20
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______3. A circuit in which electric charges can follow more than one path is called a
a. double circuit.
b. multi-circuit.
c. series circuit.
d. parallel circuit.
______4. The energy available to move electric charges is called
a. electrical force.
b. voltage.
c. static electricity.
d. resistance.
______5. The part of an atom that is free to move is the
a. electron.
b. proton.
c. nucleus.
d. neutron.
______6. An electric circuit is shown below. The accompanying table shows the current
measured at different levels of resistance.
Resistance
()
0.10
0.50
2.5
10.0
Current
(A)
15.0
3.0
0.60
0.15
Based on the data shown in the table, what is the voltage drop across the variable
resistor?
A. 1.5 V
B. 6 V
C. 9 V
D. 12 V
______7. Mr. Jenkins constructed a circuit consisting of a variable source, wires, and a
resistor. In order to triple the amount of current, how should he change the voltage of
the source?
A. make the voltage three times larger
B. make the voltage one-third as great
C. make the voltage nine times larger
D. make the voltage one-ninth as great
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Electricity: CHAPTER 20
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______8. The circuit diagram below shows three resistors, an ammeter, and a battery.
How much current flows through the ammeter?
A. 1.0 A
B. 6.0 A
C. 13.0 A
D. 24.0
______9. A 72 W navigation unit on a commercial aircraft has a 24 V power supply and uses 3
A of electric current. What is the electrical resistance of the navigation unit?
A. 4 
B. 8 
C. 13 
D. 22 
______10. When a light bulb is turned on, energy changes from one form to another. Which of
the following best describes this change?
A. sound energy to light energy
B. nuclear energy to light energy
C. electrical energy to light energy
D. magnetic energy to light energy
______11. Marta has a radio in her room. It requires electricity in order to play. Which of the
following is necessary in order for electricity to move from the source to the radio?
A. a circuit
B. a magnet
C. a light bulb
D. an insulator
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Electricity: CHAPTER 20
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MCAS Open Response Question:
Look at the objects shown below.
Some of these objects are conductors of electricity and some are insulators.
a. List all the objects that are conductors.
b. List all the objects that are insulators.
c. Describe the difference between a conductor of electricity and an insulator of electricity.
Written Response Answer the following questions in complete
sentences.
1. Kamaria is hanging a string of decorative lights. When she plugs the lights in, she notices
that one light in the string is burned out. The rest of the lights are still lit. Are the lights wired in
a series circuit or in a parallel circuit? How do you know?
2. What are the forms of energy involved in a simple circuit? There are four major forms of
energy involved. Write two to three sentences discussing the energy transformations that take
place.
Problem Solving: Use your MCAS formula sheet to help you. SHOW ALL WORK.
1. A hairdryer is plugged into a 120 Volt outlet and draws 30 Amps of Current. What is the
Power rating of the hairdryer?
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Electricity: CHAPTER 20
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2. How much current is flowing through the ammeter?
3 ohms
9 volts
A
Key Term Review: Match each term in Column B with its definition in Column A. Write the
correct letter in the space provided. Each term is used once and only once.
Column A
_______ 1. atomic particle with a negative electric charge
_______ 2. material through which electric charges do not flow
easily
_______ 3. flow of electric charges through a conductor
_______ 4. switch that opens a circuit if too much current is flowing
_______ 5. circuit in which electric current follows only one path
_______ 6. material through which electric charges flow easily
_______ 7. atomic particle with a positive electric charge
_______ 8. current in which electrons change direction at a regular
rate
_______ 9. circuit in which electric current can follow more than
one path
Column B
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
p.
q.
r.
proton
alternating current
parallel circuit
electron
electric circuit
series circuit
resistance
volt
insulator
electric current
voltage
circuit breaker
ampere
conductor
ohm
Watt
Joule
power
_________ 10. the rate at which work is done.
_______ 11. unit used to measure resistance
_______ 12. energy available to move electric charges through a
wire
_______ 13. path that an electric current follows
_________ 14. the units used for power
_______ 15. opposition to the flow of electric current
_______ 16. unit used to measure electric current
_________ 17. the units used for energy
_______ 18. unit used to measure voltage
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Electricity: CHAPTER 20
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MAGNETISM & ELECTRIMAGNETISM:
_______ 1. Magnetism is a force of
a. gravity. b. weight. c. voltage.
d. attraction or repulsion.
_______ 2. The magnetic lines of force are closest together at a magnet's
a. poles. b. north pole. c. south pole. d. middle.
_______ 3. An electric appliance needs a motor to change electrical energy into
a. heat energy. b. mechanical energy. c. chemical energy. d. light
energy.
_______ 4. An electromagnet is
a. a permanent magnet.
b. a temporary magnet.
c. a weak magnet.
_______ 5. Of the following examples, the one that will make an electromagnet with the
strongest magnetic field is a
a. wire with four coils.
b. straight wire.
c. wire with three coils. d. wire with two coils.
_______ 6. Of the following items, the one that would be attracted to a magnet is
a. an iron bar. b. a glass jar. c. a wooden toothpick. d. a plastic cup.
_______ 7. When a material, such as an iron nail, is made into a magnet, magnetism has
been
a. destroyed. b. strengthened. c. weakened. d. induced.
_______ 8. When the north and south poles of two magnets are facing each other, they
a. attract each other
b. repel each other
c. have no effect on each other d. magnetize each other.
_______ 9. One way to increase the strength of an electromagnet is to
a. increase the resistance of the wire.
b. Decrease the current in the wire.
c. Increase the current in the wire.
_______ 10. All magnetism is created by:
a. Natural magnets.
b. Movement of charges.
c. Current–carrying wires.
_______ 11. Which of the following will experience a force in a magnetic field?
a. A magnet.
b. A stationary charge.
c. A moving charge.
d. A and C.
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Electricity: CHAPTER 20
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Vocabulary Matching: Match the key term in the column on the right with its definition
on the left.
__________ 1. Device that changes
mechanical energy into electrical energy.
__________ 2. Process by which a material
can be made into a magnet
__________ 3. Temporary magnet made by
wrapping a current-carrying wire around an
iron core
__________ 4. Force of attraction or repulsion
by magnetic materials.
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
Compass
Electric Generator
Electric Motor
Electromagnet
Electromagnetism
Magnetic Domain
Magnetic Field
Magnetic Induction
Magnetic Lines of Force
Magnetism
Magnetosphere
Pole
__________ 5. Region of Earth’s magnetic
field
__________ 6. Lines that show the shape of a
magnetic field
__________ 7. Two ends of a magnet
__________ 8. Device that changes electrical
energy into mechanical energy
__________ 9. Area around a magnet where
magnetic forces can act.
__________ 10. The relationship between
electricity and magnetism.
__________ 11. Groups of atoms whose
magnetic poles are all lined up in the same
direction.
__________ 12. A tool that uses magnetism
to aid in navigation.
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Electricity: CHAPTER 20
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Decide which is the stronger electromagnet in each figure, A or B. Write
your answers in the spaces provided.
1. ______________
2. ______________
MCAS Open Response Question:
BE SURE TO ANSWER AND LABEL ALL PARTS OF EACH QUESTION.
The picture below shows five ring magnets that are stacked around
a pencil.
When the pencil is held upright, the magnets do not touch, but
appear to be suspended in the air. When the magnets are pushed
closer together, they quickly return to their original positions.
a. Explain why the magnets are not touching each other and
appear to be suspended in air.
b. Describe what would happen if the pencil were taken away.
The magnets were then rearranged so they stacked around the pencil as shown below.
a. Explain how the magnets were rearranged on the pencil so that they stacked
directly on top of each other as shown.
b. Describe what would happen if the pencil were
taken away.
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Electricity: CHAPTER 20