Two resistors, one of value 8Ω and another of unknown resistance R, are connected in parallel across a 24V d.c. supply. It is required that the unknown resistor R should carry 60% of the total current drawn from the supply.
(i) Derive an expression for R in terms of the given numerical fraction and the known resistance.
(ii) Calculate the numerical value of R.
(iii) Determine the current through each resistor and the total current supplied by the source.