Four resistors 5Ω, 10Ω, 15Ω and 20Ω are connected so that 5Ω and 10Ω form one parallel branch while 15Ω and 20Ω form another parallel branch. The two branches are then connected in series across a 24V supply of negligible internal resistance.
(i) Calculate the equivalent resistance of each parallel branch.
(ii) Hence find the total resistance of the circuit.
(iii) Determine the power dissipated in the 10Ω resistor.