In an alternating current circuit, the direction of current changes continuously.

• A. True (correct)
• B. False
• C. Sometimes
• D. Not defined

Answer: (A)

In alternating current circuits the direction of current changes continuously because the voltage source keeps reversing its polarity. As the AC voltage swings from positive to negative, the force on the charges flips direction, so current flows first one way and then the other. At typical power-line frequencies (like 60 Hz), this reversal happens many times per second. Even though the instantaneous current is constantly flipping, the average current over a full cycle is zero, while energy can still be delivered to a load because voltage and current coincide in time during portions of the cycle. This is different from direct current, where the current flows in a single direction. The other options don’t fit because the current direction in a steady AC source is not fixed, not undefined, and it does not only change occasionally—it changes continuously.