Due to what is current formed in conductors?

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 $text{ C}$)

$A$ $60\,W$ bulb carries a current of $0.5\,A$. The total charge passing through it in $1$ hour is ............ $C$.

Define electric current and explain it. Write its $SI$ unit.

$5 \, A$ of current is passed through a metallic conductor. The charge flowing in one minute in coulombs will be:

$A$ steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?