If the mass deposited in $30 \ s$ is $m$,what will be the $E.C.E$ of the copper voltameter?

Two sources of equal $emf$ $E$ are connected in series to an external resistance $R$. The internal resistances of the two sources are $R_1$ and $R_2$ $(R_2 > R_1)$. If the potential difference across the source having internal resistance $R_2$ is zero,then:

In the given circuit,find the current in each resistance. (in $A$)

$A$ coil of $100 \, W, 220 \, V$ is cut into two equal parts and connected in parallel. How much heat in $J$ is produced in $1 \, sec$?

The equivalent resistance and potential difference between $A$ and $B$ for the circuit shown are respectively:

The power dissipated in the $ 3 \Omega $ resistance in the following circuit is: (in $W$)