244x 9V battery - Page 1
Forum section: electronics / general

author: ndictu
author_rank: Regular Contributor
timestamp: September 18, 2011, 03:25:53 pm
content: Quote fromreddit thread:Quote

author: Bored@Work
author_rank: Super Contributor
timestamp: September 18, 2011, 04:52:05 pm
content: Real great when he is starting to look for the humming/failed battery with his bare hand, wearing his wedding ring. And those tiny wire he is using ...The internal resistance of the batteries might also not help him. What is the internal resistance of a 9V battery? 1 Ohm (of course varying with load, temperature, etc.)? Let's say it is 2 Ohm. His 224 batteries then maybe have a total resistance of 500 Ohm. At 2 kV this is good enough for 4 A. Deadly. Maybe the contacts add some more resistance.Could it be that he is the father of The Nutter?

author: Chet T16
author_rank: Frequent Contributor
timestamp: September 18, 2011, 04:53:23 pm
content: I seen the thread title and i figured 244x was a part number and it wasn't going to be about what i hoped, wrong!Thats pretty cool

author: FreeThinker
author_rank: Frequent Contributor
timestamp: September 18, 2011, 06:27:14 pm
content: My first concern was for the nice polished table..... Does this make me a bad person?

author: ndictu
author_rank: Regular Contributor
timestamp: September 18, 2011, 06:55:40 pm
content: Quote from: FreeThinker on September 18, 2011, 06:27:14 pmYeah I was expecting one battery to explode/melt and catching the table on fire. Kind of like the guy with homemade transformer shorting wires over a carpet.

author: saturation
author_rank: Super Contributor
timestamp: September 18, 2011, 06:58:58 pm
content: 9v cost about 30c to 50c each, on the low side, and $1 on the high side, a pricey experiment. The poster must have had access to a discarded lot because one can find the breakdown limits of many components with half or far less VDC.What is the breakdown voltage of the insulation of leads used? Good DMM probes are rated to 1kV, but you'd really not want to use them at those limits, and the alligators are fully unknown. In theory, new PVC breakdown begins at 3kV or so, unless there is a break in the insulation from wear or age.

author: Simon
author_rank: Unknown
timestamp: September 18, 2011, 07:02:05 pm
content: He did infact say that they are all used and if you look at the batteries many have "used" written on them. No I'd not try this at home, but seeing them all coupled up like that - wow

author: Zero999
author_rank: Super Contributor
timestamp: September 18, 2011, 07:47:56 pm
content: If the batteries are used there's probably a greater risk of an explosion due to cell reversal.I think a more worthwhile experiment would be an electrostatic motor, although it won't have the same wow factor.

author: Lawsen
author_rank: Frequent Contributor
timestamp: September 18, 2011, 10:26:47 pm
content: How do we find the internal resistance of a battery?I have surfed this website:http://www.electronicspoint.com/do-calculate-battery-internal-resistance-t10177.htmlWhat is the resistance of 244, 9 V DC batteries? We could calculate the current. V=I, current times R, resistance.We could not use this massively serial circuit of 244, 9 V batteries, because the casing was shown melting by the internal resistance of the batteries and slight noises from the melting batteries and heat.

author: Lawsen
author_rank: Frequent Contributor
timestamp: September 18, 2011, 10:42:57 pm
content: Using 244, 9V batteries to power an electrostatic or even a large motor to see it spin is as wow. Just seeing current wasted as arc flashes is not much use and it raises more questions than answers. How much current? What useful applications could it powered? How could 244, 9 V batteries be connected to be cooler, little heat, and more efficient? What is the torque or RPM, if 244, 9 V batteries powered a motor? Could the current be measured and regulated with voltage regulator? It was interesting to watch the largest serially connected 9 V batteries to date.

author: Zero999
author_rank: Super Contributor
timestamp: September 19, 2011, 04:20:46 pm
content: The current created by 244 9V batteries connected in series and short circuited will be the same as the current created by one 9V battery short circuited.