Power output depends on equivalent resistance Steps:

• Power P = V² / R_eq, where V is fixed mains voltage; lower R_eq gives higher P.
• Position 1 (series): R_eq = 2R (highest resistance, lowest power).
• Position 2 (parallel): R_eq = R/2 (lowest resistance, highest power).
• Position 3 (single): R_eq = R (medium resistance, medium power). Why A is correct:
• Matches low power to position 1 (R_eq = 2R, P = V²/(2R)), medium to 3 (R_eq = R, P = V²/R), high to 2 (R_eq = R/2, P = 2V²/R), per P = V²/R_eq formula. Why the others are wrong:
• B assigns medium to 2 (highest power) and high to 3 (medium power).
• C assigns low to 3 (medium power) and medium to 1 (lowest power).
• D assigns low to 3 (medium power) and high to 1 (lowest power).

Final answer: A