$A$ cable of resistance $10\,\Omega$ carries electric power from a generator producing $250\,kW$ at $10000\,V$. The current in the cable is ............. $A$.

$A$ current through a wire depends on time as $i = \alpha_{0} t + \beta t^{2}$ where $\alpha_{0} = 20 \, A/s$ and $\beta = 8 \, As^{-2}$. Find the charge crossed through a section of the wire in $15 \, s$ (in $C$).

If an electron revolves in a circular path of radius $0.5 \times 10^{-10} \ m$ at a frequency of $5 \times 10^{15} \ Hz$,the electric current in the circle is .................. $mA$. (Charge of an electron $= 1.6 \times 10^{-19} \ C$)

Explain how electric current is formed. Give a suitable example.

Estimate the magnitude of current that passes through a wire, if $0.1 \text{ mol}$ of electrons flow through it in $40 \text{ min}$. (Assume Avogadro number $= 6 \times 10^{23}$) (in $\text{ A}$)

Define $1 \ Coulomb$ in terms of $1 \ Ampere$.