Hi all, I'm creating my first arduino project, and I'd like to power it with a car battery; it gives 12V-DC, and I think arduino can use it, but I have some external electronic components that need 5V (lcd, relay, etc).Can I supply 12V to arduino, to Vin pin, and get 5V from the "5V" pin for external components? It is a simple question, but I'm a newbie and I don't wont to break my arduinoThanks
NO, DO NOT CONNECT 12volt to Vin Pin. You can only connect 5volt to Vin pin.
QuoteI'm really starting to wonder where this misunderstanding comes fromNot knowing ohms law and seeing that the arduino is "rated" at a small current and the power supply "rated" at a large current. They think the two ratings have to match before it is safe, like it is with voltage.That is why I wrote this a few years back:-http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html
I'm really starting to wonder where this misunderstanding comes from
Power is defined in Physics as the ability to do work
Energy is defined in Physics as the ability to do work, and Power is the rate at which that happens