This lesson contains 25 slides, with interactive quizzes, text slides and 1 video.
Items in this lesson
Magnetism 9.3
Electromagnets
Slide 1 - Slide
How are you today?
😒🙁😐🙂😃
Slide 2 - Poll
Highlights of the Day
describe how to make an electromagnet and know that electromagnets have many applications
Values : Responsibility and Determination
Slide 3 - Slide
Basic Concepts and Ideas
Slide 4 - Slide
A material is described as _____________ if it is attracted to a magnet.
A
electric
B
magnetic
C
repulsive
Slide 5 - Quiz
Magnetic materials include the metals i_____, n_______ and c________.
Slide 6 - Open question
Iron
Slide 7 - Slide
Nickel
Slide 8 - Slide
Cobalt
Slide 9 - Slide
S_____ is another common magnetic metal. It is a mixture that contains a large proportion of iron.
Slide 10 - Open question
Steel
Slide 11 - Slide
Magnetic materials can be ___________. It means turned into a magnet.
A
magnetised
B
brushed
C
cut
Slide 12 - Quiz
__________ magnets have a magnetic field that is always there. You cannot switch the magnetic field off and on again.
A
Permanent
B
Artificial
Slide 13 - Quiz
One way to magnetise a magnetic material is by using "electricity". When this method is used, the magnet is called an ________________.
A
ferromagnet
B
electromagnetic
Slide 14 - Quiz
Electromagnets
Slide 15 - Slide
Slide 16 - Video
Give ONE application of electromagnets in daily life.
Slide 17 - Open question
Slide 18 - Slide
Slide 19 - Slide
Electromagnets
An electromagnet is made by wrapping a wire around a magnetic material, such as iron. The wire that is wrapped around is a called a coil. The material in the middle of the coil is called the core.
Slide 20 - Slide
Slide 21 - Slide
Poles of an electromagnet
You can find out which pole is which in two simple ways.
Use a magnetic compass. A magnetic compass points along magnetic field lines, so will point towards the south pole.
Use a bar magnet with known poles. Opposite poles attract and like poles repel so, by bringing the bar magnet close to the electromagnet, you can detect which pole is which.
Slide 22 - Slide
Give one way how you can find out which pole is in an electromagnet.
Slide 23 - Open question
Slide 24 - Slide
Self-survey: Rate your level of understanding and participation in this lesson.