The electrical resistivities of four materials P, Q, R, and S are given below: P: 6.84 × 10-8Ωm
Q: 1.70 × 10-8Ωm R: 1.0 × 1015Ωm S: 11.0 × 10-7Ωm
Which material will you use for making:
a) heating element of electric iron
b) connecting wires of electric iron
c) covering of connecting wires
Give reason for your choice in each case.

Question

The electrical resistivities of four materials P, Q, R, and S are given below: P: 6.84 × 10-8Ωm
Q: 1.70 × 10-8Ωm R: 1.0 × 1015Ωm S: 11.0 × 10-7Ωm
Which material will you use for making:
a)	heating element of electric iron
b)	connecting wires of electric iron
c)	covering of connecting wires
Give reason for your choice in each case.

Accepted Answer

The heating element of an electric iron is S because the resistivity of S is This material is nichrome.
The connecting wires of an electric iron is Q as it has low This material is copper.
The covering of connecting wires is R as the resistivity of R is very high and the material is

Suggested Q&A