1. The interaction between electricity and magnetism
ELECTROMAGNETISM
The interaction between electricity and magnetism

2. Definition: Electromagnet
a coil of current-carrying wire that acts as a magnet that can be turned on and off.

3. Definition: Solenoid
a current-carrying coil of wire with many loops.

4. SOLENOIDS
When a solenoid is turned on, a magnetic field is created. If a piece of iron or other ferromagnetic material is wrapped by the coils of wire in a solenoid, a magnet is created when the current is turned on.

5. Strength of ELECTROMAGNETS
The strength of an electromagnet can be increased by:
Increasing the electric current in the solenoid
Increasing the number of coil loops around the ferromagnetic material
Using a stronger ferromagnetic material (more iron content)

6. Using a stronger ferromag-netic material (more iron content)

7. Increasing the number of coil loops around the ferromag-
netic material

8. Increasing the electric current in the solenoid (more voltage)

9. Examples of Electromagnet Uses
A doorbell or an alarm
Moving junk cars
Recording data on your computer
Reading the magnetic strip on the back of a credit card
Electric motors

10. Magnetic Forces vs. Electrical Forces
Electromagnetism - interaction between electricity and magnetism
a) Magnetic forces arise from the movement of electrical charge.
b) Electrical forces arise from the movement of a magnet (induced current)

11. *Get a post-it-note *Put your name on it *Answer the question below:
What 3 factors can make an electromagnet stronger?