The unit of electric current,$.......$,is also called an ampere,named after André-Marie Ampère.

Define current,give its mathematical expression. What is its $SI$ unit?

In an experimental set-up as shown below,a piece of silver was placed touching points $A$ and $B$. Next time it was replaced by a piece of wood. In which case did the bulb glow? Give reason to justify the observation.

An electric bulb draws a current of $0.2 A$ when the voltage is $220 V$. Calculate the amount of charge flowing through it in one hour.

The $SI$ unit of electric charge is $.........$

If $4.8 \text{ A}$ current is passed through an electrical appliance,then the number of electrons passing through it in $1 \text{ second}$ will be $......$