Electricity and Magnetisim
Beau Schwabe
Posts: 6,566
I gave a science demonstration to my oldest daughters class today during my lunch covering some of the history of Electricity and Magnetism mainly focusing on magnetism.
Covered magnetic poles ... Opposites attract, and Likes repel, but I threw everyone off when I asked based on attraction and repulsion, why would a magnet want to stick to a refrigerator ( a neutral ) :-) ... showed what an electrical magnet does, progressing to a functioning telegraph, an then concept building toward making a functioning speaker in the classroom and how the same device could become a microphone. Transcending that into a motor and showing a working motor, and how it could be used in reverse similar to a microphone. I had a hand cranked 'generator" which essentially was a motor in reverse. Attaching two motors together one operating as a generator while the other operating as ... well.. a motor, ...and how changing the load on the motor increases the resistance or amount of work required by the generator.... To wrap things up, we finished with a penny and magnet race down an aluminum tube as to which one would win the race. Based on some of the concepts that we went over, they were to form a hypothesis as to why the magnet would always come in last place.
I just have to contemplate though how electromagnetism was essentially accidentally discovered by Hans Christian
Covered magnetic poles ... Opposites attract, and Likes repel, but I threw everyone off when I asked based on attraction and repulsion, why would a magnet want to stick to a refrigerator ( a neutral ) :-) ... showed what an electrical magnet does, progressing to a functioning telegraph, an then concept building toward making a functioning speaker in the classroom and how the same device could become a microphone. Transcending that into a motor and showing a working motor, and how it could be used in reverse similar to a microphone. I had a hand cranked 'generator" which essentially was a motor in reverse. Attaching two motors together one operating as a generator while the other operating as ... well.. a motor, ...and how changing the load on the motor increases the resistance or amount of work required by the generator.... To wrap things up, we finished with a penny and magnet race down an aluminum tube as to which one would win the race. Based on some of the concepts that we went over, they were to form a hypothesis as to why the magnet would always come in last place.
I just have to contemplate though how electromagnetism was essentially accidentally discovered by Hans Christian
Comments
assembly and discharge an electrolytic cap into the coil so it jumps out of the magnet!
I'm guessing
There is Hermann von Helmholz too, born the year after the discovery of the electromagnetic phenomenon by
Gosh, Heater, if you're that desperate to witness genius in action, you're welcome to watch me give a lecture on the Eastern Skunk Cabbage. Who knows? Maybe I'll have an epiphany about its metabolic biochemistry right before your very eyes. And you won't even have to die to see it. Much.
http://forums.parallax.com/showthread.php/145277-Science-Fair?p=1156995&viewfull=1#post1156995
As long as that thing doesn't start shouting "Feed me Seymore"...
No, but I was at a lecture where a motorbike was driven up and down the steps of the lecture theatre... (not by me I hasten to add).
The
Not really. Picture all the advances in science and technology you would have missed.
Well not an issue if a time machine is involved. Of course we know they don't exist or we'd have seen all the time tourists coming back to
witness the moon landings!
What would we do with out Murphy? Nothing would get discovered.
You see it all the time, teachers who don't properly prepare for their classes. Serves him right. Perhaps that is why, today, we measure lack-of-class-preparation in
Yeah... I think I catch your drift -