electromagnets - wordpress.com · using electromagnets – recycling a large electromagnet is used...

05/09/2016

ELECTROMAGNETS

©cgrahamphysics.com 2016

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

05/09/2016 ©cgrahamphysics.com 2016

HOW CAN TRAINS FLOAT ON AIR?

05/09/2016 ©cgrahamphysics.com 2016

STARTER • Lets watch this short video to learn a bit more about

magnets and how they can be used.

05/09/2016 ©cgrahamphysics.com 2016

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

05/09/2016 ©cgrahamphysics.com 2016

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.

05/09/2016 ©cgrahamphysics.com 2016

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!

05/09/2016 ©cgrahamphysics.com 2016

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!

05/09/2016 ©cgrahamphysics.com 2016

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

22 05/09/2016 ©cgrahamphysics.com 2016

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