Question

Resistance of lead is greater than that of gold.

1. Do you agree? 

2. What do you mean by resistance? 

3. What do you mean by resistivity?

Answer 1

1. Yes.

2. Resistance is the hindrance offered by a substance to the flow of electricity through it.

3. Resistivity is the resistance of a conductor of length 1 cm and area of cross section 1 cm².

R ∝ \(\frac{l}{A}\)

Or, R = ρ \(\frac{l}{A}\)

where R → Resistance and ρ → resistivity.

When l = 1 cm and A = 1 cm then, R = ?