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More ways to get Braingle...

Hair Raising Duffus

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#10935
Fun:*** (2.71)
Difficulty:** (2.08)
Category:Science
Submitted By:OD-1Aca****
Corrected By:AndrewWalker

 

 

 



Duffus Mcklutski was not the most suave debonair guy. He was a cross between Grizzly Adams and the local garbage collector. So when the girl next door remarked that he was kind of cute in a bushman sanitation worker kind of way, but would look better with curly hair and a bath, Duffus wasted no time in arranging his makeover. Not sure how he would curl his hair he started with his yearly bath. But since it had been so long since last he bathed, he had no towels in the bathroom to dry himself off. So Duffus, in a pair of shorts dripping wet, wandered out to his tool shed to see if he could do anything about his straight hair dilemma. "Hmmm, weedwacker" he muttered as he turned on the 15000v neon transformers which power the neon lights in his shed. But not watching what he was doing, he touched an open end of the transformer and still being more than damp, he was zapped with 15000 volts of electricity. Duffus was unharmed however and achieved a slight curl to his hair.
But why was Duffus almost unaffected by the 15000v shock?





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Comments

zipman
Mar 14, 2003

I like the way u tell these humourous stories. How many Duffis stories do you have?
ganderAus*
Jul 18, 2004

Shockingly good one. Is there a Duffus Mcklutski web site?
od-1Aca*
Jul 19, 2004

Not Yet but I may add a page or two to mine someday.
lessthanjake789*us*
Jun 05, 2005

great teaser, i just covered that this year in physics - high voltage sounds scary, which is why its used, but it is not the voltage that matters but the amperage - amps being the current that flows through. (real quick physics lesson - V=IR - volts = amps*resistance. so if you have 15000v but 15000000000ohms (resistance) then you have only 1 millionth of an amp, which is not very serious). awesome teaser
(user deleted)
Jul 30, 2005

FYI: Neon sign transformers are quite capable of delivering a fatal shock. 6 mA, or 6/1000 of an ampere, is all that is necessary to drive the heart into fibrillations. Many neon sign transformers are rated upwards of 75 watts, which, via Ohm's law, results in a current of 75/15,000=5 mA,enough to prevent Doofus from letting go. Skin resistance, particularly when wet, can decrease to the range of 100 -1500 ohms, much less than the resistance of a neon tube. Furthermore, the "skin effect" that causes electrons to flow only on the surface of a conductor only occurs at frequencies in the millions of hertz, i.e. radio frequencies. Neon signs operate at 60 Hz, just like every other American appliance (50 Hz if you live in England).
(user deleted)
Jul 30, 2005

FYI: Neon sign transformers are quite capable of delivering a fatal shock. 6 mA, or 6/1000 of an ampere, is all that is necessary to drive the heart into fibrillations. Many neon sign transformers are rated upwards of 75 watts, which, via Ohm's law, results in a current of 75/15,000=5 mA,enough to prevent Doofus from letting go. Skin resistance, particularly when wet, can decrease to the range of 100 -1500 ohms, much less than the resistance of a neon tube. Furthermore, the "skin effect" that causes electrons to flow only on the surface of a conductor only occurs at frequencies in the millions of hertz, i.e. radio frequencies. Neon signs operate at 60 Hz, just like every other American appliance (50 Hz if you live in England).
vbguy101*us*
Aug 23, 2006

I knew that.

It's Duffus.
AndrewWalkerAfi*
Oct 22, 2007

milliamps aren't millionths of an amp, but thousandths of an amp. And 6 milliamps will cause a heart attack.



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