A 12V power supply can be either DC (Direct Current) or AC (Alternating Current), depending on the type of device or system you're working with.
- **12V DC (Direct Current)**: This is commonly used in low-power electronics like car batteries, solar panels, and many small devices like LED lights or Arduino projects. The voltage stays constant in one direction.
- **12V AC (Alternating Current)**: This is less common in small devices but might be used in certain applications, like household appliances, where the voltage alternates between positive and negative cycles.
So, whether it is DC or AC depends on the context of where you're using it! For example, a car typically uses 12V DC, but household power outlets are usually AC (though the voltage in the US is 120V AC, not 12V).