A 2Ω resistor R1 is connected in series with a parallel combination of a 4Ω resistor R2 and a 6Ω resistor R3 across a 12V source of negligible internal resistance.
(i) Find the equivalent resistance of the entire circuit.
(ii) Determine the current through each resistor.
(iii) Calculate the power dissipated in each resistor as well as the total power drawn from the source.
(iv) If R3 is replaced by a 3Ω resistor while R1 and R2 remain unchanged, by what factor does the total power consumed by the circuit change?