Electrical resistivities of some substances at 20 ° C are given below: Silver 1 . 60 × 10 - 8 Ω m Copper 1 . 62 × 10 - 8 Ω m Tungsten 5 . 20 × 10 - 8 Ω m Iron 10 . 0 × 10 - 8 Ω m Mercury 94 . 0 × 10 - 8 Ω m Nichrome 10 . 0 × 10 - 6 Ω m Answer the following questions in relation to them: Among silver and copper, which one is a better conductor? Why?

Silver has lesser resistivity than copper. Hence, silver is better in conducting electricity than copper as resistivity is directly proportional to resistance.

Electrical resistivities of some substances at 20 ° C are given below: Silver 1 . 60 × 10 - 8 Ω m Copper 1 . 62 × 10 - 8 Ω m Tungsten 5 . 20 × 10 - 8 Ω m Iron 10 . 0 × 10 - 8 Ω m Mercury 94 . 0 × 10 - 8 Ω m Nichrome 10 . 0 × 10 - 6 Ω m Answer the following questions in relation to them: Which material would you advise to be used in electrical heating devices? Why?

The material which has the highest resistivity (Nichrome) would be the better choice for electrical heating devices. More the resistance of the wire, more heat is generated. Heat generated is directly proportional to resistance and resistance is directly proportional to resistivity.

E M B I B E

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 1 - Electricity>EXERCISE>Q 3

MEDIUM

10th CBSE

IMPORTANT

Earn 100

What is the difference between resistance and resistivity?

Important Questions on Electricity

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 1 - Electricity>EXERCISE>Q 3

Electrical resistivities of some substances at $20 ° C$ are given below:

Silver	$1.60 \times 10^{- 8} Ω m$
Copper	$1.62 \times 10^{- 8} Ω m$
Tungsten	$5.20 \times 10^{- 8} Ω m$
Iron	$10.0 \times 10^{- 8} Ω m$
Mercury	$94.0 \times 10^{- 8} Ω m$
Nichrome	$10.0 \times 10^{- 6} Ω m$

Answer the following questions in relation to them:

Among silver and copper, which one is a better conductor? Why?

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 1 - Electricity>EXERCISE>Q 3

Electrical resistivities of some substances at $20 ° C$ are given below:

Silver	$1.60 \times 10^{- 8} Ω m$
Copper	$1.62 \times 10^{- 8} Ω m$
Tungsten	$5.20 \times 10^{- 8} Ω m$
Iron	$10.0 \times 10^{- 8} Ω m$
Mercury	$94.0 \times 10^{- 8} Ω m$
Nichrome	$10.0 \times 10^{- 6} Ω m$