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I would like to power my arduino uno r3 off external power with 5v but i am not sure how many mw it should be?
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I would like to power my arduino uno r3 off external power with 5v but i am not sure how many mw it should be?
By itself, the Arduino draws very little current. Even a wimpy 9V battery can power it for quite a while.

If the Arduino has things attached, like a LCD or a GSM or Ethernet shield. the power consumption can go way up.
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