exploding resistors

[overtone]

exploding resistors
https://www.youtube.com/watch?v=ZHv6VkK ... gRsnWjSrlA

this guy likes to "test" or zap things,
mostly to destruction
including harmless slugs.

But take a look at his six phase Mercury Arc Rectifier
https://www.youtube.com/watch?v=QY6V2syGnZA

[Leo_Gnardo]

Professor Harry Meiners used to zap resistors in freshman physics lectures. Just one of his antics, ummmm, demonstrations. Those who weren't already familiar with the smell of a roasted 2-watt carbon comp got familiar real fast. All part of learning the basics V=IR and P=IV. Sort of drove the lesson home. What a way to start the day.

Next week: conservation of angular momentum, involving a bowling ball suspended by chain from the ceiling of the lecture hall. And Prof. Meiner's chin.

[martin manning]

A smaller mercury rectifier: http://www.youtube.com/watch?v=ctwLopC0X7c No arc, unless it's ill-treated. I found and watched this a while back, and this thread reminded me of it.

[romberg]

Next week: conservation of angular momentum, involving a bowling ball suspended by chain from the ceiling of the lecture hall. And Prof. Meiner's chin.

Our freshman high school science teacher actually did this! Except it was the students chin. It was also an exercise on how scientists throughout the years have had to stand up for what they believe.

Part one involved students measuring pendulums. Careful records were made of heights the small ball was released from and how high it swung on each pass. Eventually a hypothesis was arrived at. "The pendulum never comes back higher than from where it was released".

Each student was then asked if they *really* believed this. Then out came the bowling ball and chain.

Shame of it is, I don't think you can do this in schools anymore.

Mike

[Leo_Gnardo]

Next week: conservation of angular momentum, involving a bowling ball suspended by chain from the ceiling of the lecture hall. And Prof. Meiner's chin.

Our freshman high school science teacher actually did this! Except it was the students chin.

Talk about hedging your bet...

Shame of it is, I don't think you can do this in schools anymore.

Mike

No wonder todays yung'uns don't know nothin'.

Unless they hang out on TAG. Right kids?

[overtone]

My Grandfather taught physics, chemistry and apparently biology at a school somewhere in London way back. I think I was about eight or nine when he decided to teach me Ohm's Law, which of course had to be proceded by an experiment / demonstration.

The demonstration began with connecting crocodile clips to me in the kitchen which were run into a grey gadget of some kind with many knobs and dials. He then, much to his own amusement, proceded to shock me. Days like that are etched into you, even the I=V/R, V=IR and so R=V/I. That was real old school teaching.

Before lunch we turned some coils and made a couple of solenoids. I don't think he believed in pendulums any more, he would have used electricity for that work.

[billyz]

Love it

[TNblueshawk]

My Grandfather taught physics, chemistry and apparently biology at a school somewhere in London way back. I think I was about eight or nine when he decided to teach me Ohm's Law, which of course had to be proceded by an experiment / demonstration.

The demonstration began with connecting crocodile clips to me in the kitchen which were run into a grey gadget of some kind with many knobs and dials. He then, much to his own amusement, proceded to shock me. Days like that are etched into you, even the I=V/R, V=IR and so R=V/I. That was real old school teaching.

Before lunch we turned some coils and made a couple of solenoids. I don't think he believed in pendulums any more, he would have used electricity for that work.

This is great. Yeah, probably can't do that one anymore. There would be a lawsuit quickly. Heck I didn't know I could sue my parents to recoup half my college tuition they made me pay. The whole time I was just grateful they were paying half. Figured I was lucky.