# Beginners questions

Hello,

I've got some really basic questions regarding the Arduino uno. I recently purchased one to start learning. While fiddling with the breadboard i accidentaly short circuited pin 13 to ground and 5v power pin to ground for about 1-2 secs in both cases while trying to light up a red LED. Does this cause any kind off long term damage? I think the circuits might overheat because of the high current but since it short circuited for such a short time is there any serious concern for these little mistakes? Also to calculate the resistance needed for a Standard red led (1.7V 10mA) i need about 330 ohms, if i add another one the Vf will be higher (1.7v+1.7v) does that mean that the resistance will have to be smaller? What is the output voltage from the digital pins? And can i change it? Last question: In case of a short circuit in the arduino while connected to the PC is there any chance of damage to the pc?

If any of these questions have already been answered i'm sorry :( Thank you for your time

I've got some really basic questions regarding the Arduino uno. I recently purchased one to start learning. While fiddling with the breadboard i accidentaly short circuited pin 13 to ground and 5v power pin to ground for about 1-2 secs in both cases while trying to light up a red LED. Does this cause any kind off long term damage? Most likely it will.

I think the circuits might overheat because of the high current but since it short circuited for such a short time is there any serious concern for these little mistakes? You could perminantely damage the board.

Also to calculate the resistance needed for a Standard red led (1.7V 10mA) i need about 330 ohms, if i add another one the Vf will be higher (1.7v+1.7v) does that mean that the resistance will have to be smaller? Yes.

What is the output voltage from the digital pins? 0 to 5 volts.

And can i change it? No.

Last question: In case of a short circuit in the arduino while connected to the PC is there any chance of damage to the pc? Possibly, but depends what you do.