There are a few key differences between AC and DC power which result in different pros and cons for each. AC power is alternating current, meaning that the current alternates directions at set intervals. This results in a very smooth flow of power, which is why it is the most common type of power used in homes and businesses. The main con of AC power is that it can be more difficult to store than DC power. DC power is direct current, meaning that the current flows in one direction only. This can make DC power more efficient to store than AC power, but it can also result in a less smooth flow of power.