ELECTRO MAGNETISM

1. What did we learn?

2. Can we make our magnet more powerful?

3. Can we make our magnet more powerful?
•Number of Coils (wraps)
•How much current we supply

4. What uses Electromagnets?

5. What uses Electromagnets?
• Microwave
• MRI
• Disk drive
• Speaker (and a microphone)
• Induction stove (and a rice cooker)
• Pinball machine
• Printers
• Magnetic lifter and sorter
• Maglev train

6. Coil from a Microwave
CAUTION: Microwave contains a capacitor
(don’t disassemble a microwave on your own)
A capacitor is like a battery or a spring
The coil from a microwave creates a really strong electromagnet

7. Generate Electricity

8. Generate Electricity
• Coil
• Changing Electric field

9. Generate Electricity
http://www.hk-phy.org/energy/power/act_ac_gen_e.html

10. Generate Electricity
How can we make the generator spin?

11. Generate Electricity
How can we make the generator spin?
• Steam (coal, nuclear, geothermal)
• Wind
• Hydro