The term "110" typically refers to **110-volt electrical systems**, and whether it's AC or DC depends on the context:
- **110V AC (Alternating Current)** is common in household electrical systems, especially in North America.
- **110V DC (Direct Current)** is less common but can be used in specific applications, like certain types of battery-powered devices or industrial systems.
In most cases, when people refer to "110V" without specifying, they're talking about **110V AC**, which is the standard voltage for residential power in many places.