alan2here Posted June 2, 2007 Share Posted June 2, 2007 An LED is only ever on or off. That's how they work. Therefore would having it: (The next line represents the LED activity during a small part of a second) Off, Off, Off, On, Off, Off, Off, On etc... be considered cheating? Also it is going to be possible to axidently leach energy from somewhere else (e.g EM waves or vibrations from something else that is running). I presume this to be cheating. I also presume having anything lighter than air such as heluim, hydrogen or a vacume to be cheating as it will reduce the weight and allow you'r 400g thing weigh 50g. Get going on you'r radiation powered bateries. (eather alpha or uranium) and you could win by 10 years. http://www.theregister.co.uk/2005/05/18/battery_decade/ http://www.overunity.com/index.php?PHPSESSID=c63dabab4891bc6fe8416e6ffc104b83&board=33.0 Link to comment Share on other sites More sharing options...
Rocket Man Posted June 5, 2007 Share Posted June 5, 2007 an led isn't boolean. there's below minimum voltage, there's too dim to read in, there's nominal voltage, and there's making the thing catch fire. much like a normal light bulb. there's a few posts detailing what is considered cheating, electromagnetics and voltage regulating wizardry is called cheating, yes. i also think it was "mass" that counted not weight, in which case, hydrogen contributes by 2.016 grams per mol of gas. now a nuclear battery might win it. though i doubt you could raid enough smoke detectors to accumulate the alpha or beta emmisions and hence, the current required to operate an led. i have a system encased in a few grams of wax, which can run a 4v led off a single flat AAA battery but that doesn't count. Link to comment Share on other sites More sharing options...
MrMongoose Posted November 15, 2007 Share Posted November 15, 2007 Am I allowed to make my battery by connecting 200 commercially manufactured cells in parallel? Link to comment Share on other sites More sharing options...
YT2095 Posted November 16, 2007 Author Share Posted November 16, 2007 no. Link to comment Share on other sites More sharing options...
BlondeEngineer Posted May 13, 2009 Share Posted May 13, 2009 I was just thinking of a cool way for someone with cute furry critters to take advantage of their nocturnal nature.... You need to modify your running cage so that it generates electricity (i.e. flywheel) and stores this in a battery/capacitor. Then hook up unit to a wee nightlite (LED with good reflective backing does just fine.) Warning - most furry critters have an annoying habit at gnawing at live wires... Careful shielding or strategic holes drilled in side/bottom of cage may be in order so you won't end up with crispy fritters!!! Link to comment Share on other sites More sharing options...
NATT Posted July 28, 2009 Share Posted July 28, 2009 Better to make a electrolytic battery! Link to comment Share on other sites More sharing options...
Basim Posted August 4, 2009 Share Posted August 4, 2009 I tried to light the LED with kitchen cleaner. I attached 1 wire to magnesium and the other wire to copper. The result was it lasted for 23 seconds. It was quite dim though. Merged post follows: Consecutive posts mergedI tried to light the LED with kitchen cleaner. I attached 1 wire to magnesium and the other wire to copper. The result was it lasted for 23 seconds. It was quite dim though. Link to comment Share on other sites More sharing options...
yojojo12 Posted June 11, 2012 Share Posted June 11, 2012 ever thought of sticking it in an orange, more voltage from an orange then a 12v car battery, and one orange + one stone + plenty of dry leaves + one dry stick = fire an orange = essential part of any survivel kit. 13.2v = 1 large orange Link to comment Share on other sites More sharing options...
Joatmon Posted June 11, 2012 Share Posted June 11, 2012 (edited) with the exception of hookup wire and the LED, nope. although feel free to do one using those parts as well if you like, and post results, they won`t be used in the overall challenge tho. In practice you always need to use a series resistor or some sort of current limiting circuit for a LED. It will almost certainly be destroyed if you don't. Very often when you buy a LED you don't realise that it incorporates a resistor ( especially so if given recommended voltage to use such as 6v). however you can buy a LED without a resistor. http://led.linear1.o...or-with-an-led/ Edited June 11, 2012 by Joatmon Link to comment Share on other sites More sharing options...
Spyman Posted June 11, 2012 Share Posted June 11, 2012 First off, I better start with an resurrection varning, this is a very very old thread, consider yourself warned. Secondly, Joatmon, I think the challenge was about building a long standing battery without blowing up the LED. Link to comment Share on other sites More sharing options...
Joatmon Posted June 11, 2012 Share Posted June 11, 2012 (edited) First off, I better start with an resurrection varning, this is a very very old thread, consider yourself warned. Secondly, Joatmon, I think the challenge was about building a long standing battery without blowing up the LED. First of all I don't understand why I'm being warned for responding to a topic that already had a post that appeared today. I did not resurrect anything (IMO). Secondly, I don't see why I can't comment on something within my area of experience. All I said, which is true, is that connecting a battery to a LED will almost certainly destroy the LED. Additionally, different individual LEDs even of the same colour will require different voltages to survive (usually only nominally 2.2V) if used without a resistor. Now, if I'm accused of "spoiling a game" I might be able to accept that. Edited June 11, 2012 by Joatmon Link to comment Share on other sites More sharing options...
Spyman Posted June 11, 2012 Share Posted June 11, 2012 I am sorry Joatmon, I did not try to reprimand you, I apologize for being unclear with my first comment. I meant for everyone that reads this thread now, to be warned that this is an old thread, YT is not likely around anymore and the game has expired. Of course you are allowed to comment! Yes, you are fully correct, connecting a battery to a standard battery without something limiting the current will destroy it. I am NOT accusing you of anything, but AFAIK, the game was to build the battery, not the electronics needed to tune a LED to a power source. The goal was to make the battery weak enough to not blow the LED up, but yet be able to power it for a long duration. Link to comment Share on other sites More sharing options...
Joatmon Posted June 11, 2012 Share Posted June 11, 2012 I am sorry Joatmon, I did not try to reprimand you, I apologize for being unclear with my first comment. I meant for everyone that reads this thread now, to be warned that this is an old thread, YT is not likely around anymore and the game has expired. Of course you are allowed to comment! Yes, you are fully correct, connecting a battery to a standard battery without something limiting the current will destroy it. I am NOT accusing you of anything, but AFAIK, the game was to build the battery, not the electronics needed to tune a LED to a power source. The goal was to make the battery weak enough to not blow the LED up, but yet be able to power it for a long duration. No problem - I suppose I was being rather pedantic. Perhaps using a LED was not the best choice of battery load. Link to comment Share on other sites More sharing options...
Spyman Posted June 11, 2012 Share Posted June 11, 2012 Agreed, at least an resistor in series should have been allowed. Link to comment Share on other sites More sharing options...
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