Define the unit of electric current.

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

How many microamperes $(\mu A)$ are equal to $1$ milliampere $(mA)$?

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.

$1\, mA = \dots A$

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 $......$