Pick a device (paper)

Pick one of the following devices to research and write about in a 1-2 page paper.  Make sure to include a helpful diagram or two.  It is ok to talk about the history, but be sure to go into the physics - how does it work?

speaker or headphones/earbuds

telephone (regular, not cell)

guitar pickup (standard electromagnetic, not piezo)

microphone

transformer

MRI

magnetic tape recording
ruining electronics with magnets
hard drive
generator
turbine - wind, steam, water
metal detection
telegraph
phonograph (record player)
maglev trains

If you think of other ideas, let me know so I can tell you if you're in 'over your head'.

This will be due in 2 classes..