Question 126714: the resistance(R) of a wire is directly proportionnal to the lenght(L) and inversely proportional to the diameter(D) since a wire to 3 metres long with a diameter of o,25 centimetre has a resistance of 12 OHMS, calulate the length of a wire diameter of 0,3 centimetres and a resistance of 20 OHMS
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! the resistance(R) of a wire is directly proportionnal to the lenght(L) and inversely proportional to the diameter(D) since a wire to 3 metres long with a diameter of o,25 centimetre has a resistance of 12 OHMS, calulate the length of a wire diameter of 0,3 centimetres and a resistance of 20 OHMS
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R = k*L/D
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Find k:
12 = k*3/0.25
3 = 3k
k = 1
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EQUATION:
R = L/D
20 = L/0.3
L = 6 meters
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Cheers,
Stan H.
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