In a circuit, current flows from

• A. A higher voltage to a lower voltage
• B. A lower voltage to a higher voltage
• C. Voltage to current
• D. Power to resistance

Answer: (A)

In circuits, current is driven by a voltage difference, and by convention it flows from higher potential (higher voltage) to lower potential (lower voltage). That push from the positive side toward the negative side is what we call conventional current, so the flow goes from the high-voltage area toward the low-voltage area. It’s worth noting that the actual charge carriers in many circuits are electrons, which move in the opposite direction—from low to high potential—but the standard way we describe current is as positive charge flow from high to low voltage. The other statements don’t describe this driving direction for conventional current.