Maximum current input to arduino mega 2560

I've been looking all over the internet for an answer but didn't find one
And I'm scared to used on my arduino mega because I don't have another one
I have a 12V battery with 3A current ( and external power supply)
Will it fry the board ?

Not if you connect it properly to the Vin pin or power barrel. If you connect the 12V directly to the 5V or 3.3V pins (or any of the IO pins), then yes, you will fry your board.

Not to the io pins
Into the power supplier I think it’s called
The input next to the USB

It will only “consume” the current it requires. The voltage from the power supply is (approximately) constant but the current depends on the load.* The current rating for a power supply is it’s maximum rating.

For example, here in the U.S. we have 120VAC at the power outlets and that voltage is always there. If you plug-in-(and turn-on) a 100W light bulb, slightly less than 1 Amp flows. If you plug-in a toaster or hair drier, about 15 amps flows. If you plug to toasters into the same circuit, excess current flows and you trip the circuit breaker. Then you no-longer have any voltage at the power outlet until you reset the breaker.

  • Ohm’s Law say Current = Voltage/Resistance. We don’t know the “resistance” of the Arduino and it will actually change depending on the conditions.

Oh ok now I get it
You helped me a lot
Thanks both of you :heart: