The electrical resistivities of copper and aluminium are 1-62-10-8- m and 2-63-10-8- m respectively- Which is a better conductor- Why-

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Standard X

Physics

Electric Current

The electrica...

Question

The electrical resistivities of copper and aluminium are $1.62 \times 10^{- 8} Ω m$ and $2.63 \times 10^{- 8} Ω m$ respectively. Which is a better conductor? Why?

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Solution

Copper is a better conductor than aluminum because it has a lower resistivity than aluminum.
This is because resistivity is the ability of a material to resist the flow of electrons through it.
The lower the resistivity of a material, the better is the conductor.

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The electrical resistivities of five substances A, B, C, D and E are given below
A) $5.20 \times 10^{- 8} Ω m$
B) $110 \times 10^{- 8} Ω m$
C) $2.60 \times 10^{- 8} Ω m$
D) $10.0 \times 10^{- 8} Ω m$
E) $1.70 \times 10^{- 8} Ω m$

(a) Which substance is the best conductor of electricity Why?
(b) Which one is a better conductor : A or C ? Why
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Q. (a) What is meant by saying that the potential difference between two points is 1 volt? Name a device that helps to measure the potential difference across a conductor.
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(c) Electrical resistivities of some substances at 20°C are given below:

Silver	1.60 × 10⁻⁸ Ωm
Copper	1.62 × 10⁻⁸ Ωm
Tungsten	5.20 × 10⁻⁸ Ωm
Iron	10.0 × 10⁻⁸ Ωm
Mercury	94.0 × 10⁻⁸ Ωm
Nichrome	100 × 10⁻⁶ Ωm

Answer the following questions in relation to them:
(i) Among silver and copper, which one is a better conductor? Why?
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Q. The electrical resistivities of four materials A, B, C and D are given below:

A		110 × 10⁻⁸ Ω m
B		1.0 × 10¹⁰ Ω m
C		10.0 × 10⁻⁸ Ω m
D		2.3 × 10³ Ω m

Which material is : (a) good conductor (b) resistor (c) insulator, and (d) semiconductor?

(a) Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?
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Q. Two wires of equal length, one of aluminium and the other of copper have the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are preferred for overhead power cables.

(ρ_{A l} = 2.63 \times 10^{- 8} Ω m, ρ_{C u} = 1.72 \times 10^{- 8} Ω m

, Relative density of Al = 2.7, of Cu = 8.9.)

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The electrical resistivities of copper and aluminium are 1.62×10-8Ωm and 2.63×10-8Ωm respectively. Which is a better conductor? Why?

Copper is a better conductor than aluminum because it has a lower resistivity than aluminum. This is because resistivity is the ability of a material to resist the flow of electrons through it. The lower the resistivity of a material, the better is the conductor.

The electrical resistivities of copper and aluminium are $1.62 \times 10^{- 8} Ω m$ and $2.63 \times 10^{- 8} Ω m$ respectively. Which is a better conductor? Why?

Copper is a better conductor than aluminum because it has a lower resistivity than aluminum.
This is because resistivity is the ability of a material to resist the flow of electrons through it.
The lower the resistivity of a material, the better is the conductor.