Find the potential difference between points $A$ and $B$ i.e., $\left(V_{\mathrm{A}}-V_B\right)$ in the network shown in Fig.

In the circuit shown in Fig, $R_1=4 \mathrm{\Omega }, R_2=R_3=5 \mathrm{\Omega }, R_4=10 \mathrm{\Omega }$ and $\xi =6 \mathrm{V}$. Work out the equivalent resistance of the circuit and the current in each resistor.

Find the equivalent resistance between points $A$ and $B$ in Fig.

Letter $A$ as shown in Fig. has resistances on each side of arm. Calculate the total resistance between two ends of the legs.

Find the resistance between the points $A$ and $B$ of the network shown in Fig.

Find the resistance between the points $A$ and $C$ of the network shown in Fig.

A combination of four resistances is shown in Fig. Calculate the potential difference between the points $P$ and $Q$, and the values of currents flowing in the different resistances.

In Fig. $X$, $Y$ and $Z$ are ammeters and $Y$ reads $0.5 \mathrm{A}$. What are the readings in ammeters $X$ and $Z$? What is the total resistance of the circuit?