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Worksheetsresistivity
Total questions: 10
Worksheet time: 5mins
Which factor does not affect resistivity?
Length
Mass
Cross-sectional area
Temperature
The unit of resistivity is
Ω/m
Ω/m2
Ω.m
Ω.m2
The nichrome wire has a cross-sectional area of 1.3 × 10–7 m2 . Resistivity of nichrome = 1.1 × 10–6Ωm and a resistance of 53Ω. The length of the wire is
0.63m
63m
0.0063m
6.3m
Resistance of a material would be equal to resistivity when
l = T
A = l
A = T
l = R
A wire of uniform diameter 0.28mm and a length of 1.50m has a resistance of 45Ω. It's resistivity is
2.2 x 10-8Ωm
36 Ωm
1.8 x 10-6Ωm
3.4 x 10-7Ωm
Two resistors R1 and R2 are made of wires of the same material. The wire used for R1 has half the diameter and is twice as long as the wire used for R2.
What is the value of the ratio resistance of R1 / resistance of R2?
8
4
1
0.5
