In the circuit shown in Fig, each of the three resistors of $4 \mathrm{\Omega }$ can have a maximum power of $20 \mathrm{W}$ (otherwise it will melt). What maximum power can the whole circuit take?

 

Find the heat produced per minute in each of the resistors shown in Fig.

In the circuit shown in Fig, the heat produced by $4 \mathrm{\Omega }$ resistance due to current flowing through it is $40 \mathrm{cal} {\mathrm{s}}^{-1}$. Find the rate at which heat is produced in $2 \mathrm{\Omega }$ resistance.

The $2.0 \mathrm{\Omega }$ resistor shown in Fig. is dipped into a calorimeter containing water. The heat capacity of the calorimeter together with water is $2000 {\mathrm{JK}}^{-1}$.  If the circuit is active for $30$ minutes, what would be the rise in the temperature of the water?

The $2.0 \mathrm{\Omega }$ resistor shown in Fig. is dipped into a calorimeter containing water. The heat capacity of the calorimeter together with water is $2000 {\mathrm{JK}}^{-1}$. Suppose the $6.0 \mathrm{\Omega }$ resistor gets burnt. What would be the rise in the temperature of the water in the next $30$ minutes?

Three resistors $R_1$, $R_2$ and $R_3$ each of $240 \mathrm{\Omega }$ are connected across a $120 \mathrm{V}$ as shown in Fig. Find the potential difference across each resistor.

Three resistors $R_1$, $R_2$ and $R_3$ each of $240 \mathrm{\Omega }$ are connected across a $120 \mathrm{V}$ as shown in Fig. Find the total heat developed across the three resistors.