5v 2a意思

"5V 2A" is a rating for the output of a power supply or charger. It specifies the voltage and current that the power supply is capable of delivering to a device.

• 5V: This is the voltage rating. It means that the power supply can provide a constant voltage of 5 volts.
• 2A: This is the current rating. It means that the power supply can provide up to 2 amps of current.

When you connect a device to this power supply, it will receive 5 volts of power at a maximum of 2 amps. This is enough to charge or power many devices that are designed to operate with a 5V input, such as smartphones, tablets, and some laptops.

The "5V 2A" rating is commonly found on USB power adapters and is a standard for many devices that use USB for charging and data transfer.