Matching
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Match each term with the correct definition. a. | charging by contact | f. | electric resistance | b. | charging by induction | g. | electromagnetic induction | c. | electric
discharge | h. | static
charge | d. | electric current | i. | magnetic domain | e. | electric
circuit |
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1.
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An imbalance of electric charge on an object.
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2.
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Transfer of electric charge between two objects that are touching one
another.
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3.
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Production of an electric current by moving a wire loop and a magnet relative
to each other.
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4.
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The flow of electrons in a circuit.
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5.
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Transfer of electric charge between two objects that are not touching one
another.
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6.
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A group of atoms that have their magnetic poles pointing in one
direction.
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7.
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A closed path in which electric charges can flow.
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8.
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Rearrangement of electric charges in an object in an electric field.
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9.
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A measure of how difficult it is for electrons to flow in an object.
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Completion
Complete each
statement.
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Unscramble the word in italics to complete these sentences.
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10.
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A material in which electrons do not flow easily is a(n) ____________________
luntsiora.
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11.
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A ____________________ lllepaar circuit is one that provides more than
one path for electrons.
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12.
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A wire in which a current flows wrapped around an iron core produces a(n)
____________________ cogenateeltrm.
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13.
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____________________ gelotva is a measure of how much electrical energy
an electron carries.
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14.
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A circuit that provides only one path for electrons is a ____________________
eeriss circuit.
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15.
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A ____________________ nuccdotro is a material in which electrons flow
easily.
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Choose the best answer in parentheses.
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16.
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The closed path in which electric charges can flow is an electric
____________________ (circuit/current).
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17.
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Electrons flow from the ____________________ (positive/negative) terminal of a
battery.
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18.
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Collisions of electrons with other particles in a circuit convert electrical
____________________ (energy/charge) into heat or light.
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19.
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V = IR is the equation that expresses the relationship known as
____________________ (Ohm’s/Ampere’s) Law.
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20.
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In the formula, V = IR, current is represented by the letter
____________________ (I/R).
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21.
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A light switch is part of a ____________________ (series/parallel) circuit if it
controls all of the lights at once.
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22.
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As the distance between two electric charges decreases, the electric force
between them ____________________ (increases/decreases).
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23.
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The electric force that one electron exerts on another electron is always
____________________ (attractive / repulsive).
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24.
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The electric field around an electron points ____________________ (toward/away)
from the electron.
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25.
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The magnetic field around a bar magnetic is ____________________
(strongest/weakest) at the magnetic poles.
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26.
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Materials such as iron are magnetic materials because they contain magnetic
____________________ (currents/domains).
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27.
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The voltage between two points in a circuit ____________________
(increases/decreases) when the electric field in the circuit increases.
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28.
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In the equation, V = IR, the letter “I” represents
____________________, which is measured in units of ____________________.
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29.
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Collisions between moving electrons in a circuit and other particles, such as
atoms, result in ____________________.
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30.
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A permanent magnet is formed when all of the ____________________of a magnetic
material line up.
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31.
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A ____________________ converts mechanical energy into electrical energy using
the relative motion of a magnet and a wire loop.
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32.
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A compass needle points north because the Earth is surrounded by a
____________________.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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33.
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The energy conversion in an electric generator is
a. | mechanical to electrical. | c. | chemical to
electrical. | b. | electrical to mechanical. | d. | electrical to chemical. |
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34.
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A stationary charged particle is surrounded by a(n)
a. | electric field. | c. | electric field and a magnetic field. | b. | magnetic
field. | d. | electric
current. |
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35.
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If the resistance in a circuit is doubled while the voltage remains constant,
the current
a. | is doubled. | b. | remains constant. | c. | is
halved. | d. | cannot be determined from the information provided. |
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36.
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The sparks that occur when you pull a wool sweater over your hair is an example
of an electric
a. | field. | c. | current. | b. | discharge. | d. | resistance. |
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37.
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Which of the following is an electric conductor?
a. | wood | c. | glass | b. | gold | d. | rubber |
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38.
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All of the following apply to an electric current, except:
a. | it is surrounded by an magnetic field. | c. | it is measured in
volts. | b. | it transfers electrical energy. | d. | it is a flow of
electrons. |
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39.
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An electromagnet is a type of
a. | permanent magnet. | c. | generator. | b. | temporary magnet. | d. | parallel
circuit. |
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40.
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Ohm’s Law expresses the relationship of
a. | series and parallel circuits. | c. | electric charge and magnetic
field. | b. | voltage, current, and electric discharge. | d. | voltage, current, and
resistance. |
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41.
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In a parallel circuit, the electrons
a. | all follow the same path. | c. | do not carry an electric
current. | b. | can follow more than one path. | d. | have a static
charge. |
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42.
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A copper wire is an example of a(n)
a. | electric circuit. | c. | insulator. | b. | magnetic material. | d. | conductor. |
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43.
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The path in which electrons flow is an electric
a. | current. | c. | insulator. | b. | circuit. | d. | field. |
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44.
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A group of iron atoms whose magnetic poles are oriented in the same direction
are a(n)
a. | electromagnet. | c. | magnetic domain. | b. | magnetic field. | d. | magnetic pole |
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Short Answer
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45.
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What happens to the total charge on a wire when a current flows through the
wire?
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46.
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In a series circuit with a constant voltage, what is the effect on current if
the number of light bulbs in the circuit is doubled?
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47.
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How can a broken wire affect a series circuit differently than a parallel
circuit?
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48.
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Make a general statement about the relationship between electricity and
magnetism. Then, identify two facts that support your statement.
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49.
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How are a battery and an electric generator similar and how are they
different?
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50.
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How can you determine whether the bulbs in a string of holiday lights are part
of a series circuit or part of a parallel circuit?
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Essay
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51.
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Describe how your day at school would be different if there were no electric
power.
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52.
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Use the information in the table to match the descriptions to the
materials.
| | Electrical Conductor | Attracted to a Magnet | | Material A | yes | yes | | Material B | yes | no | | Material C | no | no | | | |
a. iron nail
____________________ b. copper wire ____________________ c. glass rod
____________________
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