Draw a schematic diagram of a circuit consisting of $24 \mathrm{V}$ battery, a $10 \mathrm{ohm}$ resistor, a $5 \mathrm{ohm}$ resistor, a $1 \mathrm{ohm}$ resistor, an ammeter and a plug key, all connected in series. Calculate the ammeter reading in this circuit.

Resistors are given as $R_1=10 \mathrm{\Omega }, {\mathrm{R}}_2=20 \mathrm{\Omega }$ and $R_3=30 \mathrm{\Omega }.$ Calculate the effective resistance when they are connected in series. Also, calculate the current flowing when the combination is connected to a $6 \mathrm{V}$ battery.

$3$ resistors $R_1, R_2$ and $R_3$ are connected in series to a battery $V.$ Draw the circuit diagram showing the arrangement. Derive an expression for the equivalent resistance of the combination.

Calculate the current flowing through the resistors.

For the circuit shown in the diagram given:

Calculate the total effective resistance of the circuit.