electromagnets Flashcards
This is a scrap yard crane with a magnet on the end. It is sorting through rubbish.
What materials will it pick up?
Magnetic material
This is a scrap yard crane with a magnet on the end. It is sorting through rubbish.
What materials will it leave behind?
Non-magnetic materials
This is a scrap yard crane with a magnet on the end. It is sorting through rubbish.
Why doesn’t it need to touch the materials to pick them up?
Magnetism is a non-contact force.
Define electromagnet
Electromagnet is a temporary magnet produced using an electrocurrent.
Define core
Core is a rod of magnetic material placed inside a coil to make the magnetic field of an electromagnet stronger.
Define magnetise
Make into a magnet
What are the 2Cs electromagnets are made of and define them
Current: Flow of charge in a wire ( electrons)
Coil: Usually copper wire covered in insulating material
How can you provide current
Using a DC power supply
Name 3 ways you can increase the strength of an electromagnet
1- Increase current
2-Increase number of coils
2-Insert an iron core
To reverse the polarity of an electromagnet you would
reverse the direction of the current
What are most cores made out of and why
iron because it is easy to magnetise and demagnetise
What’s the problem with using steel as a core for electromagnets
It is hard to magnetise and almost impossible to demagnetise therefore it becomes permanently magnetised.
Give 2 reasons why electromagnets are better than permanent magnets
Electromagnets can be switched on and off, permanent magnets can’t be switched on and off.
Electromagnets can be made stronger, permanent magnets can’t be made stronger
List the equipment and how we make a simple electromagnet
The leads are connected to the power pack
The crocodile clips are connected to the leads
The copper coil is wound around the iron nail
The crocodile clips are connected to the copper coil
1- powerpack
2- crocodile clips
3-coil
4-iron nail
5- lead
Draw an electromagnet
check the slides
