The quantity of charge that will be transferred by a current flow of $20 \text{ A}$ over a period of $1 \text{ hour } 30 \text{ minutes}$ is:

$A$ source of $e.m.f.$ $E = 15\,V$ and having negligible internal resistance is connected to a variable resistance so that the current in the circuit increases with time as $i = 1.2t + 3$. Then,the total charge that will flow in the first five seconds will be ............... $C$.

Explain the current formed in solid conductors in the presence of an external electric field.

Current passing through a wire as a function of time is given as $I(t) = 0.02t + 0.01 \ A$. The charge that will flow through the wire from $t = 1 \ s$ to $t = 2 \ s$ is: (in $C$)

Define electric current and explain it. Write its $SI$ unit.

The current $I$ versus time $t$ graph for a conductor is shown in the figure. The average current through the conductor in the interval $0$ to $15 \, s$ is ............ $A$.