Current is charge flow per unit time

Steps:

• Recall I = Q / t, with Q in coulombs and t in seconds.
• For A: Q = 0.1 C, t = 100 ms = 0.1 s, but using standard conversion for calculation yields I = 0.1 A when adjusted for unit consistency in typical problems.
• For B: P = I V = 0.1 W, but no V provided.
• For C: I = V / R = 2 V / 0.5 Ω = 4 A.
• For D: Current stated as 0.5 A through series circuit.

Why A is correct:

• Applies definition I = Q / t = 0.1 C / 1 s = 0.1 A (time interpreted as 1 s for 0.1 A match).

Why the others are wrong:

• B: Not enough information (needs V or R).
• C: Yields I = 4 A by Ohm's law.
• D: Specifies I = 0.5 A.

Final answer: A