electromagnets - wordpress.com · using electromagnets – recycling a large electromagnet is used...
TRANSCRIPT
05/09/2016
ELECTROMAGNETS
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INVESTIGATING ELECTROMAGNETS
• Understand that passing an electrical current through a wire creates a magnetic field.
• Use electromagnets to plan and carry out an investigation.
• By the end of the class you must log in to edpuzzle.com, creating a student account and use the code eLpo4r
• Watch the movie “What is the
magnetic field” and answer the
questions as you go along
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HOW CAN TRAINS FLOAT ON AIR?
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STARTER • Lets watch this short video to learn a bit more about
magnets and how they can be used.
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WHAT ARE THE CHARACTERISTICS OF MAGNETS?
• They can attract some materials
• They can also repel other magnets
• They are usually made of iron
• They have two ends called magnetic poles
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HOW TO MAKE AN ELECTROMAGNET...
• Wrap the wire around the iron nail.
• Connect a crocodile clip to each end of the wire
• Plug the other end of the wires into the Power pack.
• Turn the Power Pack on.
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These are the questions I want answered fool; •Do more coils in the wire make an electromagnet stronger? • How many cars (paper clips) can your electromagnet attract with 10 coils. • What happens if you add more?
YOUR INVESTIGATION... Mr T. Has given up his career in acting and has decided to buy a scrap-yard in Eastbourne! He’s only been there a month and already the giant magnet he uses for moving scrap cars around has broken. Mr T. wants you to carry out an investigation into electromagnets to help him decide whether it’s worth buying one.
05/09/2016 ©cgrahamphysics.com 2016
WE ARE INVESTIGATING HOW INCREASING THE NUMBER OF COILS IN AN ELECTROMAGNET AFFECTS THE STRENGTH OF THE ELECTROMAGNET.
Variables – What could we change?
Variables – What could we change?
FAIR TEST!
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RESULTS TABLE
Number of Coils Number of Paperclips
Draw a table like this one in your books ready to carry out your investigation;
I pity the fool who doesn’t record their
results!
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CLASS RESULTS
No. Coils Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Average
10
12
14
16
18
20
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SHOWING YOUR RESULTS...
Draw a line graph showing how the number of coils affects the strength of the electromagnet.
Graph Title
Number of Coils
Pape
rclips
Lif
ted
• Write a title for your graph • The x axis (horizontal) should show the number of coils on the electromagnet • The y axis (vertical) should show the number of paper clips it picked up.
05/09/2016 ©cgrahamphysics.com 2016
USING ELECTROMAGNETS – RECYCLING
A large electromagnet is used on a recycling plant conveyor
belt to pick up and move metal cans.
What advantages does an electromagnet
have over a permanent magnet?
Which metals would the electromagnet attract?
05/09/2016 ©cgrahamphysics.com 2016