1. Electromagnetism

2. Electric current produces a magnetic field
Electromagnet
Electric current produces a magnetic field
Electromagnetism is the relationship between electricity and magnetism

5. Characteristics of magnetic field produced by a current
Can be turned off
Can have its direction changed
Can have its strength changed

7. A coil of wire with a current running through it
Solenoid
A coil of wire with a current running through it

9. How are a solenoid and a bar magnet alike and different?
Alike because both have north and south poles.
Different because the poles of the solenoid will change directions with the direction of the current.

10. Solenoid with a metallic and magnetic core (iron)
Electromagnet
Solenoid with a metallic and magnetic core (iron)
Can be turned on or off

11. Increasing the strength of an electromagnet
Increase current in solenoid
Add more loops of wire to solenoid
Wind the coils of solenoid closer together
Use a stronger magnetic metal for core

12. What are some uses of electromagnets?
The uses of electromagnets include:
Recording information on DVDs and iPods
Computer hard drives
Credit cards
Lifting heavy objects/ car lifter at the junkyard

13. Common electromagnets

14. Common electromagnets

15. Magnetic Induction
Occurs when a magnetic field is created that competes with the Earth’s own magnetic field.
Ex: Putting a compass near an electromagnet will cause the compass needle to change directions