Which solution is used as an electrolyte in a Voltaic cell?

An electric kettle of $2 kW$ works for $2 h$ daily. Calculate the $(a)$ energy consumed in $SI$ and commercial units, and $(b)$ cost of running it in the month of June at the rate of ₹ $3.00$ per unit.

In an electrical circuit,two resistors of $2\,\Omega$ and $4\,\Omega$ respectively are connected in series to a $6\,V$ battery. The heat dissipated by the $4\,\Omega$ resistor in $5\,s$ will be ........ $J$.

$100 \, J$ of heat is produced each second in a $4 \, \Omega$ resistance. Find the potential difference across the resistor. (in $, V$)

How much work is done in moving a charge of $2 \, C$ across two points having a potential difference of $12 \, V$ (in $, J$)?

In the circuit diagram shown,the two resistance wires $A$ and $B$ are of the same area of cross-section and same material,but $A$ is longer than $B$. Which ammeter,$A_{1}$ or $A_{2}$,will indicate a higher reading for current? Give a reason.