MAGNETISM AND ELECTROMAGNETISM Ray Langton YES! REALLY

Oh No! Not another Power Point! “ Tail End Charlie” Death by Power Point My aims in these sessions 1.To refresh/reinforce/reinvigorate/re- assure regarding Physics 2. To use practical classroom teaching methods as exemplars.

How Science Works Ideas and Evidence

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:

Scientific: are based on reliable evidence Non-scientific: ideas based on whim or opnion

Key ideas  Only 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 ideas  Only 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

Attract, Repel or Nothing happens? N S S N N S N S Aluminium N S Steel N S Plastic N S

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.

Show Red for False Green for True False True False True False

Earth’s Magnetic Field Which is correct? S NN S RED GREEN

Why is this correct? Think about the way a compass points and the rules of repulsion and attraction of magnets. S N

Sketch the Earth’s Magnetic Field 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

Draw a graph (This will be the average)

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 ideas  Only 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

Plenary Dear Me Reflect on ideas, knowledge, understanding, methods of teaching etc.