A 24V battery is connected across two resistors of 4Ω and 6Ω joined in parallel. A third resistor of 12Ω is initially isolated by an open switch.
(i) Calculate the current through each of the two branches before the switch is closed.
(ii) After the switch is closed, the 12Ω resistor becomes part of the parallel network. Determine the current through each of the three branches.