What will happen to the resistance of the circuit,if the current through it is doubled?

$A$ series circuit has only one conducting path for the electrons that move through it; a parallel circuit has multiple conducting paths.

Three $2 \,\Omega$ resistors,$A, B$ and $C,$ are connected as shown in the figure. Each of them dissipates energy and can withstand a maximum power of $18 \,W$ without melting. Find the maximum current $I$ that can flow through the circuit.

If a $12 \ V$ battery is connected to the arrangement of resistances given below,calculate
$(i)$ the total effective resistance of the arrangement and
$(ii)$ the total current flowing in the circuit.

What is the lowest resistance that can be obtained by combining four coils of resistances $4\, \Omega, 8\, \Omega, 12\, \Omega$ and $24\, \Omega$?

Find the resistance of a bulb rated as $100 \, W - 250 \, V$.