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All Wired Up (Posted on 2004-06-30) Difficulty: 3 of 5
There are twelve wires that run from your cellar to your roof. Unfortunately on their journey they could be randomly mixed up, so you can't tell which cellar wire-end corresponds to which roof wire-end. You have a battery and a light bulb, and you can temporarily twist wires together. You can also travel from the cellar to the roof and back again any number of times. Thus you can construct circuits and test the wires at either end in order to deduce what is going on. But itís a long way to the roof. So, starting at the bottom, what is the minimum number of journeys you have to make, in order to work out exactly which wire-end in the cellar corresponds with which wire-end on the roof?

No Solution Yet Submitted by Sam    
Rating: 2.7500 (8 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionSolutionGary Abramson2006-09-11 22:40:24
Six, SimpleGateKiller2006-02-28 17:12:27
re: Combinating methodsBruce Brantley2004-10-23 19:10:43
SolutionRyan2004-10-20 04:55:41
Solutionfor hugoLeigh Lillico2004-07-24 00:51:24
Combinating methodsHugo2004-07-21 08:11:15
CongratulationsHugo2004-07-21 04:07:39
Solutionmy best solutionLeigh Lillico2004-07-21 01:07:43
SolutionYeah sorryHugo Bauwens2004-07-18 13:26:45
SolutionThink in series, not parallelHugo Bauwens2004-07-18 10:12:54
simpler solution than Hew'sSara2004-07-17 08:15:47
A GuessMichael2004-07-15 14:52:19
2 complete journeys (up and down twice)Hew BG2004-07-15 11:31:34
re: my solutionHew BG2004-07-15 11:09:28
my solutiontom2004-07-14 13:39:40
Simpler solution, one tripEric Schroeder2004-07-12 00:19:42
My SolutionLeigh Lillico2004-07-09 18:44:15
Hints/Tipsre: understandable solutionSteve2004-07-09 07:33:40
Solutionunderstandable solutionSteve Graeff2004-07-08 10:31:05
Solutionre(2): Solution?Marcelo2004-07-06 06:17:35
re: Solution?Charlie2004-07-04 22:25:42
SolutionSolution?Marcelo2004-07-04 13:52:55
re: none 'survivor'-ish answerCharlie2004-07-01 14:13:50
wiring questionProcker2004-07-01 11:43:24
none 'survivor'-ish answerRenee2004-07-01 10:00:37
SolutionSolutionstan2004-06-30 18:54:02
re(2): SolutionRichard2004-06-30 16:20:08
re: Saving one trip? -- No, what was I thinking?Charlie2004-06-30 15:43:21
SolutionSaving one tripCharlie2004-06-30 15:27:53
re: SolutionCharlie2004-06-30 15:03:46
(Clever) SolutionEric2004-06-30 14:53:04
Solutionsolution in...Charlie2004-06-30 14:47:50
SolutionSolutionRichard2004-06-30 14:42:15
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