A series battery of $6$ lead accumulators, each of emf $2.0 \mathrm{V}$ and internal resistance $0.25 \mathrm{\Omega }$ is charged by a $230 \mathrm{V}$ d.c. mains. To limit the charging current, a series resistance of $53 \mathrm{\Omega }$ is used in the charging circuit. What is power dissipated as heat? Account for the difference in the two cases.

The following graph shows the variation of terminal potential difference $V$, across a combination of three cells in series to a resistor, versus the current, $i$: Calculate the emf of each cell

The following graph shows the variation of terminal potential difference $V$, across a combination of three cells in series to a resistor, versus the current, $i$: For what current $i$, will the power dissipation of the circuit be maximum?

Apply Kirchhoff’s rules to the loops PRSP and PRQP to write the expressions for the currents $I_1$, $I_2$ and $I_3$ in the circuit shown in Fig.

Use Kirchhoff’s rules to determine the value of the current $I_1$ flowing in the circuit shown in Fig.

Using Kirchhoff’s laws, determine the currents $I_1$, $I_2$ and $I_3$ for the network shown in Fig.