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The resistors should be arranged in parallel to generate a current of 2.5 A. This is because when resistors are placed in parallel, the total resistance decreases, allowing more current to flow. In this case, the total resistance would be (1/((1/20)+(1/5))) = 4 ohms. Using Ohm's Law (I = V/R), the total current would be 10V / 4 ohms = 2.5 A.
With the resistors in parallel, the 20-ohm resistor would have 10 V / 20 ohms = 0.5 A of current flowing through it. Similarly, the 5-ohm resistor would have 10 V / 5 ohms = 2 A of current flowing through it. This distribution of current is due to the fact that the current will divide between the resistors based on their individual resistances.