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Oh No! Not another Power Point!
• “Tail End Charlie”• Death by Power Point
My aims in these sessions1. To refresh/reinforce/reinvigorate/re-
assure regarding Physics2. To use practical classroom teaching
methods as exemplars.
Opinions: Pupils should be taught:
• A card sort activity – pupils discuss and differentiate between scientific and non-scientific opinions
To distinguish between statements based on scientific facts and those based on whim or opinion
Opinions
• Scientific: are based on reliable evidence
• Non-scientific: ideas based on whim or opinion
Sort the following opinions into those that are:
Key ideasOnly a few metals are magnetic
The ends of magnets are called the North and South Pole of the magnet
There is a ‘law of magnets’
Magnets and electro-magnets generate a magnetic force field
Magnetic field lines are invisible, but can be shown to have regular symmetrical patterns
Theory indicates that magnetism in metals is caused by tiny magnetic domains
The Earth has a magnetic field
Magnetism can be induced by an electric current
Electro-magnets have advantages over permanent magnets
The strength of an electro magnetic device can be varied
Electro magnetic induction forms the basis of many useful tools and equipment
WHAT DO I KNOW?
• In groups• On post-its provided jot down ‘bits’ of
knowledge that you remember about magnetism and electro-magnetism
• Put all your post its together and group them
• Ask each other to explain any you don’t understand
Key ideasOnly a few metals are magnetic
The ends of magnets are called the North and South Pole of the magnet
There is a ‘law of magnets’
Magnets and elector-magnets generate a magnetic force field
Magnetic field lines are invisible, but can be shown to have regular symmetrical patterns
Theory indicates that magnetism in metals is caused by tiny magnetic domains
The Earth has a magnetic field
Magnetism can be induced by an electric current
Electro-magnets have advantages over permanent magnets
The strength of an electro magnetic device can be varied
Electro magnetic induction forms the basis of many useful tools and equipment
Red Green Cards/Show thumbs
• First “Who let the dog’s out?”• Thumbs next slide• Red green cards following 3
Are these statements correct?
• Like poles attract, unlike poles repel.• A north pole will attract a north pole.• A south pole will repel a north pole.
Why is this correct?• Think about the way a
compass points and the rules of repulsion and attraction of magnets.
S N
Objectives
• make an electromagnet• identify independent and
dependent variables• complete practical work carefully
and safely
Today we are learning about electromagnets.By the end of today’s lesson I will be able to:
Question• What question are you asking?
• What is the independent variable
• What is the dependent variable
• What question can you raise linking the two?
Variables
Independent variable
Dependent variable
Control variables
This is the variable that we will change
This is the variable that we will measure
We will keep these variables the same
Conclusion
I found out that as I increased the independent variable
the dependent variable increased / decreased.
Conclusion
• Any anomalous results? What are these? You can look at your graph or your results table.
• Support your prediction by taking readings from your graph.
• Can you explain your findings using your scientific knowledge?
Evaluation
Look at your line of best fit. The more accurate the points the closer they will be to the line of best fit. The less accurate they are the further away from the line they will be.
Animation Heinemann Interactive
• Animation Electro Magnets Heinemann 2 8J.6 Animation Electro Magnets
ADVANTAGES AND APPLICATIONS OF
ELECTROMAGNETISM
Advantages
Applications
Bells, Buzzers, Relays,
Motors/Generators
Transformers
Key ideasOnly a few metals are magnetic
The ends of magnets are called the North and South Pole of the magnet
There is a ‘law of magnets’
Magnets and electro-magnets generate a magnetic force field
Magnetic field lines are invisible, but can be shown to have regular symmetrical patterns
Theory indicates that magnetism in metals is caused by tiny magnetic domains
The Earth has a magnetic field
Magnetism can be induced by an electric current
Electro-magnets have advantages over permanent magnets
The strength of an electro magnetic device can be varied
Electro magnetic induction forms the basis of many useful tools and equipment