What kind of current is stored in a 9-volt battery?

A 9-volt battery stores direct current (DC). This type of current flows in a single direction, which is characteristic of batteries and other energy storage devices. When you connect a load, such as a device or circuit, to a 9-volt battery, it provides a steady voltage and current consistent with that DC nature.

Direct current is commonly used in most electronic devices because it allows for stable and predictable operation, making it ideal for powering consumer electronics, toys, and various small appliances. In contrast, alternating current (AC) flows back and forth and is typically used for power distribution in homes and businesses. Since the 9-volt battery is a static source of energy, it does not produce alternating current, and thus the other options regarding alternating and high-frequency current do not apply in this context.