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

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.

List in a tabular form two differences between a voltmeter and an ammeter.

How many electrons constitute a total charge of $1 \ C$?

If $1 \text{ ampere}$ electric current passes through a conductor,how many electrons will pass per second?

Which electrical appliance with the given rating will draw the maximum current from the source?