The control schematic shows the source voltage and total loop resistance. What current should the ammeter indicate?

Why A is correct

Ohm's law gives I = V/R = 24/12 = 2 amperes; multiplying voltage by resistance produces the wrong quantity. The best answer is therefore “2 amperes.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.