Download Notes Ch 7 - Humble ISD

Name
Date
Class
Overview
Magnetism and Its Uses
Directions: Circle the term in parentheses that correctly completes the sentence.
1. The north pole of one magnet will be attracted to the (north/south) pole of
another magnet.
2. In an iron nail that is not a magnet, the magnetic domains are
(arranged randomly/aligned).
Directions: Complete the concept map using the terms in the list below.
mechanical energy
electrical energy
galvanometers
transformers
electric motors
Uses of
electromagnetic coils
include
3.
4.
5.
that
measure the
strength of
that change
that increase
or decrease
the
electric
current
electrical
energy
voltage
to
of
to
mechanical
energy
alternating
current
7.
generators
that change
6.
Magnetism and Its Uses
15
Name
Date
Class
Section 1 ■ Magnetism
Directions: Use the following terms to complete the crossword puzzle.
north
two
domain
magnetic
opposite
permanent
like
poles
Across
2. Type of magnet that keeps its magnetic properties for a long time
4. Group of aligned atoms that behaves like a magnet
5. Number of poles of a horseshoe magnet
6. Magnetic poles that attract one another
8. Magnetic poles that repel one another
Down
1. Type of force that becomes stronger as two magnets are brought closer together
3. Direction a compass needle points
7. Parts of a magnet where the magnetic field is strongest
16 Magnetism and Its Uses
Name
Date
Class
Section 2 ■ Electricity and
Magnetism
Section 3 ■ Producing Electric
Current
Directions: For each of the following, write the letter of the term or phrase that best completes the sentence.
1. You can increase the strength of an electromagnet by
a. adding loops to the coil
b. reducing the current
.
2. A transformer that
voltage has more loops of wire in its
primary coil than in its secondary coil.
a. increases
b. decreases
3. An electric fan plugged into a wall outlet runs on
a. direct
b. alternating
current.
4. The current in an electric motor comes from
.
a. direction of the current
b. amount of current flowing
Directions: Study the following diagram. Then identify each part by filling in each blank below.
5. A step-up transformer increases voltage to reduce heat loss.
6. An electric motor uses electrical energy to open a garage door.
7. A generator produces electricity when a coil of wire is rotated in a
magnetic field.
8. A step-down transformer decreases voltage for safety reasons.
Magnetism and Its Uses
17
Name
Date
Class
Key Terms
Magnetism and Its Uses
Directions: Match the term in the first column with the definition in the second column by writing the correct
letter in the space provided.
1. magnetic domain
2. magnetism
3. magnetic poles
4. galvanometer
5. electric motor
6. electromagnet
a. temporary magnet made by placing a
piece of iron inside a coil of wire that
carries an electric current
b. device that changes electrical energy
into mechanical energy, such as that
used to turn an electric fan
c. places on a magnet where the
magnetic field is the strongest
d. device that increases or decreases the
voltage of electrical current
7. direct current (DC)
e. device that uses an electromagnet to
measure electric current
8. transformer
f. device that produces electric current
by rotating a coil of wire in a magnetic
field
g. group of atoms whose magnetic poles
are aligned
h. electric current that reverses direction
regularly as it flows through a wire
i. properties of magnets and their
interactions
j. process of producing an electric
current in a loop of wire by either
moving a magnet through the loop or
moving the loop through a magnetic
field
k. electric current that flows only in one
direction through a wire
9. electromagnetic induction
10. generator
11. alternating current (AC)
18 Magnetism and Its Uses