A current of 3.2 mA flows through a conductor. If charge on an electron is -1.6 x 10^-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.

Find the potential difference required to flow a current of 300 mA in a wire of resistance 20 Ω.

A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more, same or less when the bulb is not glowing.

Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.