$Ampere-hour$ is a unit of

An electron moves with a constant speed of $4 \times 10^6 \, m/s$ in a circle of radius $10 \, cm$. Find the electric current at any point on the circle.

Define $1 \ Coulomb$ in terms of $1 \ Ampere$.

The current flowing through a wire decreases linearly from $10 \text{ A}$ to zero in $4 \text{ s}$. Find the total charge flowing through the wire in the given time interval. (in $text{ C}$)

The current through a wire depends on time as $i = (2+3t)\, mA$. The charge crossing through a section of the wire in $1\, min$ is .............. $C$.

In a hydrogen discharge tube,it is observed that through a given cross-section,$3.13 \times 10^{15}$ electrons are moving from right to left and $3.12 \times 10^{15}$ protons are moving from left to right per second. What is the electric current in the discharge tube and what is its direction?