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Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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As you stated you have a total of 5Amps. At 5 Volts thats 25 Watts which is a no-brainer for a typical computer power supply. Be aware that even though a CPU power supply may have a given rating … supply for the Arduino, there won't be any problem with that either. After all, the power supply is designed for the purpose of powering electronics. …
answered May 27 '11 by David Gardner