Once the effective resistance over the whole circuit is found, the total current is given by Ohm's Law:
The equivalent voltage was calculated in question 1. The resistance from A to B was found in question 3. First, the resistance between C and D must be found. The resistance in the two branches is 6W and 10W, respectively, since the resistors are in series. The total equivalent resistance in the CD branch is found to be
The resistor combination has now been simplified to two resistances in parallel. Thus the effective resistance for the circuit is given by