I'm just getting started using Arduino.
I upload my program to the board and it runs. But if the board loses power the program is gone next time I supply power. How can I keep the program on the Uno and be able to turn it off and on? Or do I need to keep power to the board so that it is always 'on'? If so how much current would the Uno typically draw if the program were in standby mode and not really doing anything?