Is electrostatic potential a scalar quantity or a vector quantity?

The $I-V$ graph for a given metallic wire at three different temperatures is shown. Which of these represents the highest temperature?

How many electrons will there be in $1.6 \ C$ charge?

Define electrostatic potential at a point.

Mention one reason why tungsten is used for making the filament of an electric lamp.

If the charge on an electron is $1.6 \times 10^{-19} \text{ C}$,find the approximate number of electrons in $1 \text{ C}$.