Describe how to change the

strength of an electromagnet

Identify common devices that use an electromagnet

Tell at least 2 ways you can increase the strength of an electromagnet.

•

More batteries/volts

•

more coils

•

larger iron core

•

thick copper wire

•

tight coils

1.5 V #1 #2 1.5 V 1.5 V

#1 #2

#1 #2

#1 #2

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

6

NAME: ______________________________________ CLASS: __________________

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 ___________

Worksheet 1 – Planning for Your Electromagnetic Fishing Pole 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.

ITEM MATERIAL(S)

Draw and label your design here:

Pole Core

Must be iron/magnetic

Battery

9v max Biggest is lantern battery (1)

Switch (include in sketch) Item(s): Shape: Type/Size: How Many: Materials: How it works: Attachments How will everything be held together?

Name: ____________________

Worksheet 2 – Testing Your Electromagnetic Fishing Rod

Class: ____________________

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 Tested

Example: Nail Core, 100 Coils, Tight and Neat Wind

Results, Observations, and Notes

Example: Picked up 12 Paper Clips, Some clips fell off when raised, light and hard to control.

1.

Required

2.

Required

3.

Required

4.

Optional

5.

Optional

Worksheet #3 – Derby Day Name: ____________________ Class: ____________________ •

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. ________________________________________

ITEM WORKSHEET #1 Planning Page WORKSHEET #2 Testing Page WORKSHEET #3 Derby Day ABLE TO PICK UP AT LEAST 1 PAPERCLIP FISHING POLE & PACKET TURNED IN ON TIME PTS. POSSIBLE PTS. EARNED

7 6 4 1 2

TOTAL

20

COMMENTS

Which electromagnet would be stronger?

Draw 2 electromagnets that only have 1 variable changed.

Finished Early?

•

Discovery Education

: Future Power virtual lab • http://www.wonderville.ca/asset/save-the-world 13

Finished Early?

• Click Arrow button to continue.

ippex online • Click “Download”, then “open”. View

both

tabs at top: Magnet & Electromagnet Magnets and Electromagnets Magnetism, Magnetic Field, Electromagnets – PhET

• PhET Energy Skate Park Conservation of Energy, Kinetic Energy 1. Click “Download” 2. Check box for “Show Pie Chart” 3. Check box for “Bar Graph”

Complete Energy Skate Park worksheet

15