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 transformers
Uses of electromagnetic coils
include
3. 4. 5.
galvanometers
electric motors
that measure the strength of
electric current
that change
that increase or decrease the
generators
that change
6.
electrical energy
voltage
to of to
mechanical alternating energy current
7.
Magnetism and Its Uses 15

Name Date Class Section 1 ■Magnetism
Directions: Use the following terms to complete the crossword puzzle.
north domain opposite like
two magnetic permanent
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
poles
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 current. a. direct b. alternating
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
7. direct current (DC)
8. transformer
9. electromagnetic induction
10. generator
11. alternating current (AC)
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
e. device that uses an electromagnet to measure electric current
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
18 Magnetism and Its Uses