What is the voltage and current requirement for an Arduino Uno?

AI Thread Summary
The Arduino Uno requires a supply voltage of 5V, which can be provided via USB or an external adapter. The microcontroller itself draws only a few microamperes of current, while the entire board consumes a few milliamperes, primarily for powering the LED indicators. Users should ensure that their power source meets these specifications for optimal performance. Understanding these requirements is crucial for successful project implementation. Proper voltage and current supply will ensure the Arduino functions correctly.
amaresh92
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greetings,

i have an arduino usb 328 and i want to know the supply voltage and current requirement of it.
thanks
 
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This one, which, as per the page, takes 5V from either USB or external adapter?
http://www.arduino.cc/en/Main/ArduinoBoardDuemilanove

The micro only draws a few uA of current (unless you're driving current using the microcontroller). The board probably consumes a few mA of current--the vast majority lighting up the power LED.
 
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