Three resistors {R1 = 12.0 ?, R2 = 18.0 ?, and R3 = 36.0 ?} are connected in parallel, and in turn connected to a 70.0 V source with an internal resistance of 1.00 ?. Determine the equivalent resistance of the combination. Determine the total current supplied by the source and the current in each resistor. What is the terminal potential of the source?