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Name
Date
Class
Electric Charges and Electricity
Understanding Main Ideas
Study the diagrams below, then answer the following questions in complete sentences.
1. What is the voltage source and what is the conductor in this circuit?
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2. What are two ways you could alter the wire to increase the resistance
in the electric circuit?
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3. Are the negative charges in the doorknob attracted or repelled by the
charges in the finger? How can you tell?
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4. What do the lines around the finger and doorknob represent?
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Building Vocabulary
Match each term with its definition by writing the letter of the correct definition in the
right column on the line beside the term in the left column.
5.
electric current
a. a complete, unbroken path through which electric
charges can flow
6.
insulator
b. material through which charge cannot easily flow
7.
voltage
c. the difference in electrical potential energy per
charge between two points in a circuit
8.
resistance
d. the continuous flow of electric charges through a
material
9.
conductor
e. the measure of how difficult it is for charges to flow
through a material
10.
electric circuit
f. material through which charge can easily flow
Name
Date
Class
Electric Charges and Electricity
Write the letter of the correct answer on the line at the left.
1.
A region around a charged object
where the object’s electric force is exerted
on other charged objects is an electric
A field
B outlet
C socket
D power plant
2.
A
B
C
D
Atoms contain charged particles called
protons, neutrons, and electrons
protons and electrons
protons and neutrons
electrons and neutrons
A
B
C
D
In static electricity, charges
flow continuously
flow intermittently
build up in an atom
build up on an object
3.
4.
A
B
C
D
5.
The unit for the rate of current is the
ampere
volt
ohm
joule
Which of the following does not
determine the resistance of a wire?
A temperature
B diameter
C length
D color
6.
A
B
C
D
All electrical devices contain electric
acid
gears
circuits
motors
Fill in the blank to complete each statement.
7. The amount of charge that passes through a wire in a given period of time is the rate
of electric
.
8. The electrons in conductors move about
electrons in insulators.
freely than the
9. Charges that are different ______________ each other.
10. An electric field gets _____________________ the closer it is to the charge.
11.
an object.
is the measure of how difficult it is for charges to flow through
12.
is the difference in electric potential energy per charge
between two points in a circuit.