تسجيلProblem 1HayderThe resistance of a 5 m length of wire is 600 2 Determine (a) theresistance of an 8 m length of the same wire, and (b) the length of thesame wire when the resistance is 420 Qاحمد حسن. . .(a) Resistance, R, is directly proportional to length, I,i.e. Rol.Hence, 600 2x5m or 600=(k)(5), where k is thecoefficient of proportionality. Hence,600k== 120When the length / is 8m, then resistanceR=kl=(120)(8) =9602۷۰ مشارگا آخر(b) When the resistance is 4202, 420= kl, fromwhich,420length /=420= 3.5 m120Haidrer Al Mukhtar23

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The resistance of a 5 m length of wire is 600 2 Determine (a) the resistance of an 8 m length of the same wire, and (b) the length of the same wire when the resistance is 420 Q

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Chapter42: Heat Gains And Heat Losses In Structures

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Problem 10RQ: If the R-value of a construction material is 2.0, what isits U-value? A. 0.25 B. 0 50 C. 1.0 D. 2.0

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Question

تسجيل
Problem 1
Hayder
The resistance of a 5 m length of wire is 600 2 Determine (a) the
resistance of an 8 m length of the same wire, and (b) the length of the
same wire when the resistance is 420 Q
احمد حسن. . .
(a) Resistance, R, is directly proportional to length, I,
i.e. Rol.
Hence, 600 2x5m or 600=(k)(5), where k is the
coefficient of proportionality. Hence,
600
k=
= 120
When the length / is 8m, then resistance
R=kl=(120)(8) =9602
۷۰ مشارگا آخر
(b) When the resistance is 4202, 420= kl, from
which,
420
length /=
420
= 3.5 m
120
Haidrer Al Mukhtar
23

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