Question

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:

1. good conductor
2. resistor
3. insulator, and
4. semiconductor?

Answer 1

1. A good conductor is C = 10.0 × 10⁻⁸ Ω m.
2. Resistor is A = 110 × 10⁻⁸ Ω m.
3. Insulator is B = 1.0 × 10¹⁰ Ω m.
4. Semiconductor is D = 2.3 × 10³ Ω m.