The flow of electrons continues unchanged in the same direction describes which current?

• A. Alternating current
• B. Direct current
• C. Joule's law
• D. Ohm's law

Answer: (B)

The main idea here is the direction stability of the current. Direct current is characterized by the flow of charge moving in a single, fixed direction over time. That means electrons travel steadily from one terminal through the circuit to the other, producing a constant current in one direction. This is typical of power from batteries or many DC power supplies.

Alternating current, by contrast, reverses direction periodically, so the electrons don’t drift in one direction but instead oscillate back and forth. That’s why mains electricity alternates its direction at a standard frequency (like 50 or 60 Hz), while DC keeps a steady direction.

Joule's law explains how the amount of heat produced by current flowing through a resistor depends on the current, resistance, and time, but it doesn’t describe whether the current is constant or reversing. Ohm's law describes the relationship between voltage, current, and resistance, again not the directionality of the current.