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.
ScienceClass 10ICSEAnswered 27 Mar 2026
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