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

ACTIVATE PRIOR KNOWLEDGE

Write down or draw everything

your group knows about magnetism and electricity.

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

• ff 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  Magnet

Transforms electrical

energy into mechanical 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