0

Is it safe to feed 5v dc 1amp to an Arduino uno board?

  • Yes, it is safe. – jfpoilpret May 17 '15 at 17:12
0

That's a common newbie question: "What will happen when I use a 1 A power supply for a device which only needs 0.1 A?"

The device will only draw the current it needs. It's the same as on your electricity grid. The nuclear power plant can supply a gigawatt, yet the bulb will only draw the 60 W it needs.

But do you want to apply that 5 V to the power connector? Then the 5 V is too low, you'll need at least something like 6.5 V, otherwise the onboard voltage regulator won't have enough headroom to output 5 V. If you're using the USB connector for a regulated(!) 5 V, then the onboard regulator will be bypassed. Never place an unregulated 5 V on the USB connector, though.

0

Yes as long as the polarity is correct, the board will only take the current it requires

0

The 1 Ampère you're mentioning is likely the maximum rating of the power supply, i.e. it cannot sustain higher currents for a long time. However, if you connect your Arduino board (or any other device) to your power supply, the actually flowing current will depend on the voltage U and the resistance R of the device as I = U/R. You can think of this as the Arduino drawing as much power as it needs.

In other words: you must not exceed the maximum voltage, but you don't have to (and cannot in a simple way) adjust the current flowing into the Arduino.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.