ACTIVATE PRIOR KNOWLEDGE We use electricity everyday. You probably - PowerPoint PPT Presentation

 Write down or draw everything your group knows about magnetism and electricity. ACTIVATE PRIOR KNOWLEDGE

 We use electricity everyday. You probably think about wires, but what about a magnet?  Electricity and magnetism are actually related.

ELECTRICITY Flow of electrons in a closed circuit Not natural…have to generate it. Allows us to transform energy into usable energies like: light, sound, movement, and heat

ELECTRIC CURRENT  flow of electrons which are negatively charged  Flow through a conductor  Just like a river

MAGNETISM  force of attraction or repulsion of magnetic materials - opposite attract and likes repel Magnetic materials = metals

MAGNETIC FIELD  Invisible field surrounding a magnet that pushes or pulls on objects.  It does not have to touch the object  Demo

FLOATING MAGNET DEMO

KEY CONCEPT FOR TODAY  Magnets can generate electricity.  Electricity can make a magnet. 3 devices that use this concept: 1) Electromagnet 2) Generator 3) Electric Motor

CAN WE MAKE A MAGNET OUT OF ELECTRICITY?

BIG IDEA  We can make a magnet that can be turned off and on based on supply of electricity

ELECTROMAGNET  A magnet due to electricity.  Must have:  A iron core  Copper wire wrapped around the core  Electric current / Power Source All must be connected.

 In order to have a magnetic field there has to be a current flowing

How could we make the magnetic  field stronger?

WHICH ELECTROMAGNET WOULD BE STRONGER?

WHICH ELECTROMAGNET WOULD BE STRONGER?

MAKE ELECTROMAGNET STRONGER BY… 1. Adding more coils 2. Adding more batteries http://www.fossweb.com/delegate/ssi-foss- ucm/Contribution%20Folders/FOSS/multimedia/Mag netism_and_Electricity/electromagnet.html

WHY HAVE BOTH?  Magnet = permanent  Electromagnet = not permanent  Can be turned on and off by opening and closing circuit

USES OF ELECTROMAGNETS IN REAL LIFE

CAN WE MAKE ELECTRICITY OUT OF A MAGNET?

MICHAEL FARADAY

BIG IDEA  We can generate electric currents when we move a magnet consistently through a conductive wire.

GENERATOR’S DESIGN Purpose = transform mechanical energy to electrical energy  Turbine  Copper Wire  Magnet

HOW DO WE MOVE THE TURBINE?  Steam (Fossil Fuel Power Plant)  Water (Hydroelectric Power Plant)  Wind (Wind Turbine)

GOAL OF GENERATOR  Excite electron by spinning copper in a magnet through a turbine.  Serve as a power source in a circuit but Power Outlets

 If we can use mechanical energy to transform into electrical energy, can we use electrical energy to transform into mechanical energy?

YES ….ELECTRIC MOTOR  Need:  Power Source  Copper Wire  Transforms electrical energy into mechanical  Magnet energy.  Serves as a transformer in a circuit.

WHAT IS THE DIFFERENCE BETWEEN A GENERATOR AND ELECTRIC MOTOR Electric Motor Electrical - > Mechanical Generator (Opposite) Mechanical - > Electrical

REVIEW  Electromagnet -  Generator –  Electric Motor -

ENDING ACTIVITY