Raspberry Pi Official Power Supply

Raspberry Pi Official Universal Power Supply 5.1V 2.5A 

The Official Raspberry Pi Power Supply - Shipped with easily interchangeable heads for the UK, US, EU and Australia, use your Pi in all four corners of the world! 

This PSU supports up to 2.5A of current, so it won't let you down when powering hungry devices through your Raspberry Pi 3 Model B

Technical Data

• 5.1V 2.5A Output
• 1.5m Cable
• White with Raspberry Pi Logo
• Input Voltage AC Max: 264V
• Input Voltage AC Min: 90V
• Output Connector: USB Micro
• Output Voltage Nom.: 5.1V
• Interchangeable Adaptor - EU/UK/US/AUS

A table comparing the amount of power drawn in amps under different situations: https://www.raspberrypi.org/help/faqs/#powerReqs.