Due to what is current formed in conductors?

The charge flowing in a conductor changes with time as $Q(t) = \alpha t - \beta t^2 + \gamma t^3$. Where $\alpha, \beta$,and $\gamma$ are constants. The minimum value of current is:

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

When is an electric current produced? Explain.

$A$ steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are:

Define electric current when there is no steady flow of charge.