Ever wondered why some devices run on batteries (DC) while your home gets power from the grid (AC)? In this video, we break down the key differences: DC flows in one constant direction, while AC alternates back and forth. DC has fixed positive/negative terminals; AC swaps them constantly, so it has no fixed polarity. More importantly, AC is easy to transform – making it perfect for high‑voltage long‑distance transmission (like 110 kV power lines), while DC is the go‑to for low‑voltage electronics like phones and batteries. It all comes down to their unique characteristics and where they work best. Quick, clear, and straight to the point!