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© Boardworks Ltd 2005 KS4 Electricity - Electromagnetism
© Boardworks Ltd 2005 What is a magnetic field? Where would you find a magnetic field?
© Boardworks Ltd 2005 Around every magnet is an invisible force field that will affect all magnetic objects inside it. The magnetic field of a bar magnet is seen with iron filings. N S Magnetic field What does the magnetic field around a bar magnet look like? strongest field at poles Where is the magnetic field strongest?
© Boardworks Ltd 2005 What materials will stick to magnets? Look around the laboratory or your teacher will provide a tray. See which materials will stick to a magnet and which materials will not. Magnetic materials Non-magnetic materials
© Boardworks Ltd 2005 Magnets and materials N S What materials are magnets made from? Iron or steel. What materials will magnets stick to? Iron or steel. And nickel!
© Boardworks Ltd 2005 Forces between magnets – experiment
© Boardworks Ltd 2005 Repulsion and attraction Repel/attract Unlike poles attract. Like poles repel.
© Boardworks Ltd 2005 Separating coins N S How could you separate steel and gold coins using a magnet? Steel coins would stick to magnet, gold coins would be left behind.
© Boardworks Ltd 2005 What does the magnetic field for a bar magnet look like? In what direction do magnetic field lines point? N North to South S
© Boardworks Ltd 2005 Revising magnetism I Magnets are made from which materials? ___________ What are the ends of a magnet called? __________ What do we call the area around a magnet where a magnetic force exists? __________________ What does the word attract mean?__________ What does the word repel mean?__________ Iron or steel The Poles The Magnetic Field Pull together Push apart
© Boardworks Ltd 2005 What will two north poles do if brought together? _____ What will two south poles do if brought together? ______ What will a north and a south pole do if brought together? _______ What materials are attracted by magnets? ___________ Is magnetism a contact or non-contact force? _________ Repel Attract Iron and steel Non-contact Revising magnetism II
© Boardworks Ltd 2005 Electromagnets A coil of wire acts like a bar magnet when it has an electric current flowing through it. One end of the coil becomes a north-seeking pole. One end of the coil becomes a south seeking pole. This is called an electromagnet.
© Boardworks Ltd 2005 Making an electromagnet: Apparatus: Batteries Wire Iron Nail What to do: 1.Wrap a coil of wire around the iron nail. 2.Connect the coil of wire to the batteries. 3.See how many paperclips you can pick up.
© Boardworks Ltd 2005 Results How many paperclips could you pick up? Can you think of any ways to make the electromagnet pick up more paperclips? More batteries (more current) Number of paperclips Number of batteries More turns of wire on the coil Number of paperclips Number of turns
© Boardworks Ltd 2005 Electromagnetic strength – experiment
© Boardworks Ltd 2005 The results for the number of drawing pins attracted to the electromagnet with no core are: Electromagnetic strength - results number of cells number of coils How does changing the current affect the strength of an electromagnet? How does changing the number of coils affect the strength of an electromagnet?
© Boardworks Ltd 2005 Compare the results for the number of drawing pins attracted to the electromagnet with no core and an iron core: Electromagnetic strength - results number of cells number of coils number of cells number of coils What effect does an iron core have on the strength of an electromagnet?
© Boardworks Ltd 2005 Compare the results for the number of drawing pins attracted to the electromagnet with no core and a copper core: Electromagnetic strength - results number of cells number of coils number of cells number of coils What effect does a copper core have on the strength of an electromagnet?
© Boardworks Ltd 2005 Ways to make an electromagnet stronger There are three ways to make an electromagnet stronger. Do you know them? 1.___________________ 2.___________________ 3.___________________ More turns on the coil More electrical current Using an iron core S N What happens if you turn the battery around in an electromagnet? S The poles on the coil reverse, north becomes south and south becomes north.
© Boardworks Ltd 2005 What do like poles do? A.Attract and repel B.Attract C.Repel D.Stick together
© Boardworks Ltd 2005 Which material below will not stick to a magnet? A.Steel paper clip B.Aluminium can C.Iron nail D.Steel key
© Boardworks Ltd 2005 Which of the below will not increase the strength of an electromagnet? A.More coils B.More current C.Less current D.Iron core
© Boardworks Ltd 2005 In which direction do magnetic field lines always point? A.East to west B.West to east C.South to north D.North to south
© Boardworks Ltd 2005 Which of the following is not a use of electromagnets? A.Fridge magnets B.Loud speakers C.Relays D.Circuit breakers
© Boardworks Ltd of 20 © Boardworks Ltd of 26 KS4 Physics Electromagnetism.
© Boardworks Ltd 2003 Electromagnets Core Describe the pattern of the magnetic field due to currents in straight wires and in solenoids Describe applications.
© Boardworks Ltd of 20 © Boardworks Ltd of 29 KS3 Physics 8J Magnets and Electromagnets.
1 of 8© Boardworks Ltd of 8© Boardworks Ltd 2014 What are magnets? Magnets are made from magnetic materials, such as iron and steel. These are.
Between two magnets, is the attraction stronger, is the repulsion stronger, or are the two forces the same? attract repel polarity strength.
Magnets Summarize the properties of magnets and electromagnets (including polarity, attraction/repulsion, and strength).
Magnetism 4th grade Science. What is a magnet? Any object with magnetic force.
MAGNETISM. We can see magnetic field lines with the aid of a sprinkle of IRON FILINGS.
Electromagnets D. Crowley, Electromagnets To know how to make, and test the strength of an electromagnet.
© Boardworks Ltd of 40. © Boardworks Ltd of 40.
SECTION 6: MAGNETISM AND ELECTROMAGNETISM Chapter 21 Magnetism and Electromagnetism.
© Boardworks Ltd 2003 Electromagnetism : Magnetic? Which of the metals below are magnetic metals? Aluminium(Al) Silver (Ag) Iron (Fe) Gold (Au) Nickel.
© OUP: To be used solely in purchaser’s school or college 8J Magnets and electromagnets Magnets Magnetic fields 8J Magnets and electromagnets Electromagnetism.
© Boardworks Ltd 2003 Magnetic Materials Learning Objectives: To describe what materials are magnetic To describe how the magnetic field varies around.
Marvelous Magnets! Determine that only certain types of objects are attracted to magnets. 3 rd Grade Science.
Magnets D. Crowley, Magnets To be able to draw field lines around a magnet, and to understand what these show Thursday, April 30, 2015.
© Boardworks Ltd A slide contains teacher’s notes wherever this icon is displayed - To access these notes go to ‘Notes Page View’ (PowerPoint 97)
What makes an electromagnet? Chapter 4 Lesson 4. Vocabulary Preview Electromagnet: a magnet that has coils of current-carrying wire around an iron core.
Magnets and Electromagnets. What are magnetic materials A magnetic material is attracted to a magnet. Only iron (Fe), nickel (Ni) and cobalt (Co) are.
© Boardworks Ltd 2003 KS4 Electricity – Uses of Electromagnetism.
Magnetism. What is magnetism? Magnetism is the force of attraction between magnets and magnetic objects.
Hosted by Ms. Bristow Magnetism RHROpticsMisc
Magnetism By: Manisha Shrestha. What is a magnet? A magnet is an object that attracts certain materials, usually objects that are made of iron or steel.
Electromagnetic Force. 2 Components of the Electromagnetic Force Electric Force – causes static electricity and causes the flow of electric charge to.
Magnets. Attraction No, not that type of attraction! Magnets have a powerful force that attracts or moves certain metals towards them!
Magnets and Electromagnets Magnets exert forces at a distance on magnetic materials like iron and steel Magnets pull and push other magnets N-N repelS-S.
Question: Why are magnets so important?. Magnetism 2/19/15 Magnetism- refers to the properties and interactions of magnets in which there is a force of.
What is Magnetism??? Hmmm…. Magnetism – A force of attraction and repulsion.
Who Wants To Be A Millionaire? Magnetism Question 1.
Lesson 9: Magnetism & Electricity Pg CRCT coach.
Magnetism. What is Magnetism? magnetism is the force of attraction or repulsion of magnetic materials. Surrounding a magnet is a magnetic field that applies.
Magnets. Section 1: Magnets Magnets and magnetism.
Magnetism & Electromagnetism Drill: What happens to the forces between magnets as they get closer together? Objective: SWBAT demonstrate mastery of magnetism.
What is a Magnet? When two magnets are close, they create pushing or pulling forces on one another. These forces are strongest at the ends of the magnets.
Learning Targets Magnets and Electricity Investigation 1 Review INVESTIGATING MAGNETS AND MATERIALS.
Know that magnetism is the force of attraction or repulsion of magnetic materials. Surrounding a magnet is a magnetic field that applies a force, a.
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited.
Magnets, Magnets and More Magnets. Explore Using the material given, find things around the room that stick to it.
Electromagnetism. Magnets Magnets are materials that produce a magnetic field. Magnets can only exert a force on some metals ( iron, cobalt and nickel)
Lesson 1.6 Magnets and magnetic fields - teacher’s plan.
Notes and Review Some is old and some is new Pay attention and pass the test Sit in your assigned seats.
MAGNETISM AND ELECTROMAGNETISM. Magnetism = the phenomenon of physical attraction for iron observed in magnets, inseparably associated with moving electricity.
FIK2, FIR1 & FIR2. FIK2- What is an electromagnet? Electromagnets are magnets that have their magnetic field produced by electric current. The magnetic.
WHOLE BRAIN. Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required.
Battery Paper Clip Coiled wire, resting in curve of paper clip End of wire with one side stripped of coating (not to scale) Disk Magnet Side View Front.
What Makes an Electric Motor Work? The Science and Technology Behind Electric Motors.
1.A magnet can attract magnetic material (e.g. iron, steel, cobalt or nickel) or another magnet placed near it 2.There is a magnetic field around a magnet.
Motors Noadswood Science, Motors To know how motors function and Fleming’s left hand rule Wednesday, October 21, 2015.
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