The electrical resistivity of three materials A, B and C at 20°C is given below: (i) Classify these materials as conductor, alloy and insulator. (ii)…

(i) A - Insulator B - Alloy C - Conductor (ii) A: Plastic - handle of an electric iron. B: Nichrome - used as a heating element in an electric iron. C: Copper - electric wires. / A: Rubber- foot of the electric stove. B: Nichrome - used as a heating element in an electric stove. C: Copper- electric wires.

CBSE 2025 · Region 4 · Set 1 · Q32 · 3 marks

The electrical resistivity of three materials A, B and C at $\displaystyle 20$°C is given below:
Material Resistivity $\displaystyle (\Omega \mathrm{m})$
A $\displaystyle 10^{17}$
B $\displaystyle 44 \times 10^{-6}$
C $\displaystyle 1.62 \times 10^{-8}$
(i)
Classify these materials as conductor, alloy and insulator.
(ii)
Give one example of each of these materials and state one use of each material in the design of an electrical appliance say an electric stove or an electric iron.

ElectricityFactors on which Resistance DependsApplyshort_answermedium

Practice Electricity →All Electricity questions

Marking-scheme solution

More from Electricity

Material	Resistivity $\displaystyle (\Omega \mathrm{m})$
A	$\displaystyle 10^{17}$
B	$\displaystyle 44 \times 10^{-6}$
C	$\displaystyle 1.62 \times 10^{-8}$