Download Electric Motors

Name ____________________________ Date ____________________ Class ____________
Using Electricity and Magnetism
■
Guided Reading and Study
Electricity, Magnetism, and Motion
This section explains how electrical energy can be transformed into mechanical
energy. It also describes what an electric motor does.
Use Target Reading Skills
As you read, make an outline about the section that you can use for review.
Use the red headings for the main ideas and the blue headings for the
supporting ideas.
Electricity, Magnetism, and Motion
I. Electrical Energy and Motion
A. Types of Energy
B.
II. Galvanometers
III. Electric Motors
A.
B.
Electrical Energy and Motion
1. If a wire with a current is placed in the magnetic field of two magnets,
the wire moves. Explain why.
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2. What is energy?
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3. When a wire with a current is placed in a magnetic field, what energy
transformation occurs?
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© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Name ____________________________ Date ____________________ Class ____________
Using Electricity and Magnetism
■
Guided Reading and Study
4. Complete the table about forms of energy.
Forms of Energy
Energy Form
Definition
a.
The energy associated with electric currents
Mechanical energy
b.
Galvanometers
5. A device that uses an electromagnet to measure small currents is called
a(n) ________________________.
6. What causes the loops of wire and the pointer to move in a
galvanometer?
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7. Circle the letter of each sentence that is true about galvanometers.
a. An electromagnet is suspended between opposite poles of an electromagnet.
b. The two sides of the wire loop in a galvanometer move in the same direction.
c. The electromagnet in a galvanometer is attached to a pointer.
d. A galvanometer has a scale that is marked to show how much the pointer turns
for a know current.
8. What is used to turn the pointer of a galvanometer?
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9. In a galvanometer, what does the amount of rotation of the loops of wire
and the pointer depend on?
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10. How do drivers of cars use galvanometers?
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© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Using Electricity and
Magnetism
_________________________________________________________________________
Name ____________________________ Date ____________________ Class ____________
Using Electricity and Magnetism
■
Guided Reading and Study
Electricity, Magnetism, and Motion
(continued)
Electric Motors
11. A device that uses an electric current to turn an axle is called a(n)
________________________.
12. What energy transformation occurs in an electric motor?
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13. A device that reverses the flow of current through an electric motor is
called a(n) ________________________.
14. The arrangement of wire loops wrapped around an iron core in an
electric motor is called a(n) ________________________.
15. What does a commutator consist of?
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16. As a commutator moves, it slides past two contact points called
________________________.
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.