Tell at least 2 ways you can increase the

strength of an electromagnet.

Describe how an electromagnet shows how magnetism & electricity relate to each other. (How does it work?)

Identify common devices that use an electromagnet

•More batteries/volts•more coils•larger iron core•thick copper wire•tight coils

#1

#2

1.5 V 1.5 V 1.5 V

#1

#2

#1

#2

#1

#2

Main Idea

Detail Detail Detail

Identifying Main Ideas

• As you read the section “Solenoids,” write three supporting details that further explain the main idea. (pg. 82)

A solenoid is useful because its magnetic field can be changed.

Its magnetic field can be turned on and off.

Its magnetic field can have its direction changed.

Its magnetic field can have its strength changed.

- What Is Electromagnetism?Solenoids• The magnetic field produced by a current has

three distinct characteristics. The field can be turned on or off, have its direction reversed, or have its strength changed.

Which electromagnet

would be stronger?Draw 2 electromagnets

that only have 1 variable changed.

9

Describe at least 3 ways to increase the strength of an

electromagnetic field.

1. Larger iron core.

2. More coils

3. More batteries

4. Thick copper wire

5. Tight coils

Goal: Build an electromagnetic fishing rod that can lift paper clips from one container and drop them into another. *The Team 1 Derby winner will be the student who lifts & transfers the most paper clips in one minute.

Requirements: Complete this packet and a working electromagnet fishing rod.

Worksheet 1 – DUE _________________

Worksheet 2 – DUE ____________________

Worksheet 3 & fishing rod – DUE ___________

NAME: ______________________________________ CLASS: __________________

Fri., Apr. 19Mon. Apr. 29

Tues. May 7

Worksheet 1 – Planning for Your Electromagnetic Fishing Pole

Draw and label your design here:

Directions: Use this worksheet to make a detailed plan for building your electromagnetic fishing pole. After you build a first model, testing and improving it will be important steps. As you make plans and build your fishing pole, keep in mind that you may replace some parts later.

Introduction: The different parts of the pole are the rod itself, a metal core wrapped in wire and powered by a battery, and a switch to turn the electromagnet on and off. In the space provided, make a detailed plan for constructing your electromagnetic fishing pole and sketch your proposed design with labels.

Pole

Core Item(s):

Shape:

Battery Type/Size:

How Many:

Switch(include in sketch)

Materials:

How it works:

AttachmentsHow will everything be

held together?

ITEM MATERIAL(S)

9v maxBiggest is lantern battery (1)

Must be iron/magnetic

Name: ____________________

Class: ____________________

Worksheet 2 – Testing Your Electromagnetic Fishing Rod

Directions: You will need to test your different versions of your fishing pole. Does one choice of core work better than another? Is a core with 200 turns of wire twice as strong as a core with 100 turns of wire? How will you measure the lifting ability of each fishing pole version? One way is to count how many paper clips it will lift at once. Another way would be to see how heavy an object your pole can lift. Use the table below to record the data on your tests. Remember to change only one variable at a time. Remember to consider the freshness of the battery in your testing.

Description of Model TestedExample: Nail Core, 100 Coils, Tight and Neat Wind

Results, Observations, and NotesExample: Picked up 12 Paper Clips, Some clips fell off when raised, light

and hard to control.

1.

2.

3.

4.

5.

Required

Required

Required

Optional

Optional

Name: ____________________

Class: ____________________

Worksheet #3 – Derby Day

• HYPOTHESIS: I predict that my electromagnet will pick up & move _________________ paperclips in one minute.

• RESULTS: How many paperclips did your device pick up during the contest? ____________________

• CONCLUSIONS: What part of your fishing pole was the most successful? EXPLAIN.

• CONCLUSIONS: What part of your fishing pole was the least successful? EXPLAIN.

• CONCLUSIONS: Identify 4 variables that affect the strength of an electromagnet.

A. ________________________________________ B. ________________________________________

C. ________________________________________ D. ________________________________________

WORKSHEET #1

Planning Page

7

WORKSHEET #2

Testing Page

6

WORKSHEET #3

Derby Day

4

ABLE TO PICK UP

AT LEAST 1 PAPERCLIP1

FISHING POLE & PACKET

TURNED IN ON TIME2

TOTAL

20

ITEM PTS. POSSIBLE PTS. EARNED COMMENTS