Tennessee SPI Objective: Check for Understanding Essential Question(s) Electromagnets Notes Science Tennessee SPI Objective: Describe the basic principles of an electromagnet. Instructions 1) First click on "View" from the top-menu bar. 2) Then click on "Slide Show" from the drop-down menu. 3) Then use the right-arrow button on your keyboard to advance through this presentation. Check for Understanding Experiment with an electromagnet to determine how to vary its strength. Essential Question(s) What are the basic properties of electromagnets? How do I vary the strength of an electromagnet?

Notes Science SPI 0807:12.2 Electromagnets Electromagnets An electromagnet consists of a solenoid wrapped around an iron core attached to a source of electricity 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.

Electromagnet Properties SPI 0807:12.2 Electromagnets Notes Science Electromagnet Properties Unlike permanent magnets, electromagnets can be turned on and off as needed. You can adjust the strength of an electromagnet two ways 1) Use more electrical current 2) Use more coils in the solenoid

Electromagnets: Three Main Components SPI 0807:12.2 Electromagnets Notes Science Electromagnets: Three Main Components (1) Solenoid , (2) Iron Core, (3) Source of electricity

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes Science How do we use electromagnets? Commonly found in electrical motors and switches Also used to… To lift objects Example: Junkyard crane-magnets Example: Maglev trains To propel objects Example: Railguns as weapons Example: Railguns as launch platforms To look inside of people Example: Magnetic Resonance Imaging (MRI)

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes How do we use electromagnets? Science To lift objects: Example: Junkyard crane-magnets Video Clip: Scrapyard Electromagnet In Action

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes How do we use electromagnets? Science To lift objects: Example: Maglev trains (magnetic levitation) Video Clip (show 1st 45 sec): How Maglev Trains Work

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes How do we use electromagnets? Science To propel objects: Example: Railguns as weapons Video Clip (stop at 2 min:15 secs): US Navy Railgun

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes How do we use electromagnets? Science To propel objects: Railguns as launch platforms (for spacecraft) NASA is testing spacecraft launch railguns to replace rockets

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes How do we use electromagnets? Science To propel objects: Railguns as launch platforms (for aircraft) Video Clip (stop at 1:08 secs): Electromagnetic Catapult

How do we use electromagnets? SPI 0807:12.2 Electromagnets Notes Science How do we use electromagnets? To Look Inside of People: Magnetic Resonance Imaging (MRI) Video Clip: MRI Magnetic Field Strength

Science Questions SPI 0807:12.2 Electromagnets Here is an example of a question you might see on a quiz or test.

Science Questions SPI 0807:12.2 Electromagnets Here is an example of a question you might see on a quiz or test.

Science Questions SPI 0807:12.2 Electromagnets Here is an example of a question you might see on a quiz or test.

Science Questions SPI 0807:12.2 Electromagnets Here is an example of a question you might see on a quiz or test.

Science Questions SPI 0807:12.2 Electromagnets Here is an example of a question you might see on a quiz or test.