An electric bulb should be connected to how much voltage line if it draws an electric current of $0.5\, A$,the resistance of the filament of that bulb being $440\, \Omega$ (in $, V$)?

When a $12\, V$ battery is connected across an unknown resistor,there is a current of $2.5\, mA$ in the circuit. Find the value of the resistance of the resistor.

Explain the term resistance. Give its $SI$ unit of measurement.

If the cross-sectional area of a conducting wire is doubled,what will be the effect on its resistance?

Resistance of a metal wire of length $1\, m$ is $26\, \Omega$ at $20^{\circ} C$. If the diameter of the wire is $0.3\, mm$,what will be the resistivity of the metal at that temperature?

$A$ child has drawn the electric circuit to study Ohm's law as shown in the figure. His teacher told him that the circuit diagram needs correction. Study the circuit diagram and identify the errors,then describe the correct circuit configuration.