A 15V 250ma power adapter is also called a 15V 250ma power supply, it is important for a laptop to be used as a part of the laptop equipment and cable. It is important to note that the power supply is 15V 250ma or 15V 250ma power supply is different.
The 15V AC power adapter is usually a 15V AC adapter. However, it is also called the 15V AC DC power adapter, or the 15V AC power supply at Alibaba.com. It is also called a 15V AC power adapter or usually 15V AC DC adapter in these types.