5v 2a是什麼意思

"5V 2A" is a rating for the output of a power supply or charger. It means that the device is capable of providing 5 volts of direct current (DC) at a maximum current of 2 amperes (A). This rating is often seen on USB chargers and power adapters.

The "5V" refers to the voltage, which is a measure of the potential difference between two points in a circuit. In this case, the output voltage is 5 volts. The "2A" refers to the current, which is the rate of flow of electric charge through a conductor. In this case, the maximum current that can be provided is 2 amperes.

When you connect a device that is compatible with this power supply, it will draw the amount of current it needs up to the maximum of 2 amps. The voltage will remain constant at 5 volts, providing a stable power source for the device.