Direct current is the flow of electricity that voltage is always constant and the direction of the current does not change.
A typical source of direct current is a dry battery.
Direct current is often described as "DC" (acronym for Direct Current).

● Advantages

• Electricity is stable
Since the voltage and current are constant, it can be used as a power supply.

• It can charge
You can charge the battery or storage battery.　　　　

● Disadvantage

• Electricity has a direction
Since current flows in a specific direction, connecting electrical components incorrectly can cause devices to malfunction or become damaged.