$A$ current of $0.5\, A$ is drawn by a filament of an electric bulb for $10$ minutes. Find the amount of electric charge that flows through the circuit. (in $C$)

Calculate the number of electrons that would flow per second through the cross-section of a wire when $1 \, A$ current flows in it.

Name a device that can be used to maintain a potential difference across a conductor. Also,draw its circuit symbol.

What is the minimum resistance which can be made using five resistors each of $1/5\,\Omega$?

The potential difference between the terminals of an electric heater is $60\, V$ when it draws a current of $4\, A$ from the source. What current will the heater draw,if the potential difference is increased to $120\, V$ (in $, A$)?

Draw a schematic diagram of a circuit consisting of a cell of $1.5 \, V$, a $10 \, \Omega$ resistor, a $15 \, \Omega$ resistor, and a plug key, all connected in series.