Ohm goes geocaching Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(regular)
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NB/PS: Ny placering fra juni 2019 / new position from June 2019
Georg Simon Ohm was a German physicist born in Erlangen (N 49º35.208 E 011º00.498), Bavaria, on March 16, 1787. As a high school teacher, Ohm started his research with the recently invented electrochemical cell, invented by Italian Count Alessandro Volta. Using equipment of his own creation, Ohm determined that the current that flows through a wire is proportional to its cross-sectional area and inversely proportional to its length or Ohm's law. The importance of Ohm’s work is stressed by the fact that the unit for electrical resistance is named Ohm. One Ohm was earlier defined as the resistance of a mercury column 106,3 cm long and 1 mm2 in cross-section at 0 ºC.
Vi oplever en rivende teknologiske udvikling og hører dagligt om nye imponerende landvindinger indenfor it, medico, rumforskning og andre high-tech områder. Denne udvikling er muliggjort af en lang række af tidligere bidrag fra kloge og flittige personer som for eksempel Georg Simon Ohm (1787-1854), der fandt ud af sammenhængen mellem længden, tværsnittet (materialet) og ledningsevne af en elektrisk leder og sammenhængen mellem strøm, spænding og modstand som er ledningsevnens reciprokke værdi. Denne sammenhæng er kendt som Ohm’s (lille) lov, der siger at:
Strøm (I) er lig med spænding (U) divideret med modstand (R): I = U/R
Det betyder f.eks at strømmen fordobles hvis spændingen bliver dobbelt så stor (med den samme modstand). Eller at strømmen halveres hvis modstanden fordobles (med samme spænding)
Denne lovmæssighed har enorm betydning for design af elektriske kredsløb og vil være kendt af mange. Mindre kendt er det måske, at Ohm’s lov også kan bruges til beregning af koordinaterne til geocaching!
Koordinaterne ovenfor er koordinaterne for en bekvem parkeringsplads, cachens koordinater er N 55° 51.X, E 012º 27.000+Y, hvor X og Y skal beregnes som angivet nedenfor:
X: Modstanden i Ohm (afrundet, 3 cifre) i en pære der bruger 0,0142A ved 12V
Y: Modstanden ved 20ºC (Ohm, afrundet, 3 dec. efter komma) af en 57,16 m lang kobbertråd med en diameter på 1,2 mm
Koordinaterne kan evnt. kontrolleres med geochecker.com (link nedenfor)
Nyd denne dejlige skov, nu du er her. God tur.
We are living in a time where impressive technological advances within it, medico, space and other high-tech areas are constantly made. The basis for this is the important contributions from bright people one of them being Georg Simon Ohm (1787-1854), who established the relationship between the length, cross-section (substance) and the conductivity of a conductor and the relation between current, voltage and resistance (the reciprocal of conductivity). This relation is known as Ohm’s law:
Current (I) is equal to voltage (U) divided by resistance (R): I = U/R
This means that the current is doubled if the voltage is doubled (same resistance) or that the current becomes half if the resistance is doubled (same voltage)
It is commonly known that Ohm’s law has tremendous importance for the design of electrical and electronic circuits but maybe less known that Ohm’s law can be used to calculate the coordinated for geocaching!
The coordinates above lead to a convenient parking area. The coordinates for the cache are N 55° 51.X, E 012º 27.000+Y, where X and Y are to be calculated using Ohm’s law:
X: The resistance (Ohm’s, rounded off to 3 digits) in a bulb drawing 0.0142A current at 12V
Y: The resistance at 20ºC (Ohm’s, rounded off, 3 dec. after seperator) of a 57.16 m long copper wire with a diameter of 1.2 mm
Enjoy this beautiful wood now you are here. Good luck!
You can check your answers for this puzzle on
(visit link)
Geochecker.com
Additional Hints
(Decrypt)
Qra fcrpvsvxxr zbqfgnaq sbe xboore re 0,0167 (Buz*zz2/z) irq 20 P. Gur fcrpvsvp erfvfgnapr sbe pbccre vf 0,0167 (Buz*zz2/z) ng 20 P.