Notes Science

Essential Question(s)What are the basic properties of electromagnets?How do I vary the strength of an electromagnet?

Tennessee SPI Objective:Describe the basic principles of an electromagnet.

Check for UnderstandingExperiment with an electromagnet to determinehow to vary its strength.

SPI 0807:12.2Electromagnets

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Electromagnets

Notes ScienceSPI 0807:12.2

Electromagnets

F.Y.I. -Electric current in the wire produces a magnetic field which lines up atoms in the domains of the iron core forming an electromagnet.

An electromagnet consists of a solenoid wrapped around an iron core attached to a source of electricity

Notes ScienceSPI 0807:12.2

Electromagnets

Electromagnet Properties

You can adjust the strength of an electromagnet two ways

Unlike permanent magnets, electromagnets can be turned on and off as needed.

1) Use more electrical current2) Use more coils in the solenoid

Electromagnets: Three Main Components

Notes ScienceSPI 0807:12.2

Electromagnets

(1) Solenoid , (2) Iron Core, (3) Source of electricity

Notes Science

Commonly found in electrical motors and switches

Also used to…To lift objects

Example: Junkyard crane-magnetsExample: Maglev trains

To propel objectsExample: Railguns as weaponsExample: Railguns as launch platforms

To look inside of peopleExample: Magnetic Resonance Imaging (MRI)

SPI 0807:12.2Electromagnets

How do we use electromagnets?

Notes Science

To lift objects: Example: Junkyard crane-magnetsVideo Clip: Scrapyard Electromagnet In Action

SPI 0807:12.2ElectromagnetsHow do we use electromagnets?

Notes ScienceSPI 0807:12.2

ElectromagnetsHow do we use electromagnets?To lift objects: Example: Maglev trains (magnetic levitation)Video Clip (show 1st 45 sec): How Maglev Trains Work

Notes ScienceSPI 0807:12.2

ElectromagnetsHow do we use electromagnets?

To propel objects: Example: Railguns as weaponsVideo Clip (stop at 2 min:15 secs): US Navy Railgun

Notes ScienceSPI 0807:12.2

ElectromagnetsHow do we use electromagnets?

To propel objects: Railguns as launch platforms (for spacecraft)NASA is testing spacecraft launch railguns to replace rockets

Notes ScienceSPI 0807:12.2

ElectromagnetsHow do we use electromagnets?

To propel objects: Railguns as launch platforms (for aircraft)Video Clip (stop at 1:08 secs): Electromagnetic Catapult

SPI 0807:12.2ElectromagnetsNotes ScienceHow do we use electromagnets?

To Look Inside of People: Magnetic Resonance Imaging (MRI)Video Clip: MRI Magnetic Field Strength

Here is an example of a question you might see on a quiz or test.

Questions ScienceSPI 0807:12.2Electromagnets

Here is an example of a question you might see on a quiz or test.

Questions ScienceSPI 0807:12.2Electromagnets

Here is an example of a question you might see on a quiz or test.

Questions ScienceSPI 0807:12.2Electromagnets

Here is an example of a question you might see on a quiz or test.

Questions ScienceSPI 0807:12.2Electromagnets

Here is an example of a question you might see on a quiz or test.

Questions ScienceSPI 0807:12.2Electromagnets