Deduce the expression for electrical conductivity of a conductor using the quantum free electron theory of metals. 8 a]Deduce the expression for electrical conductivity of a conductor using the quantum free electron theory of metals. Deduce the expression for electrical conductivity of a conductor using the quantum free electron theory of metals. Deduce the expression for electrical conductivity of a conductor using the quantum free electron theory of metals. Deduce the expression for electrical conductivity of a conductor using the quantum free electron theory of metals.