Questions

British businessman Mark Tucker, currently group chief executive and president of insurance group AIA, will take over from Douglas Flint as the new Chairman of HSBC in October.

The lightest computer is the tablet.

Tractor was the single most important invention to farmers.

Teens drinking are at risk of date rape, becoming an alcoholic, HIV and other STDs.

Resistivity :

Resistivity is a measure of the resistance to the flow of electrons. 

Conductivity :

Conductivity is just the inverse of resistivity, σ = 1/ρ, where σ is conductivity and ρ is resistivity.

Example:

Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance.