Where can I know voltage between GND(ground) and each port of UNO R3? Currently I'm new to arduino uno r3.
Where can I find each voltage between each port and GND(ground)?
Or can the voltage be changed?
I don't want to break my led bulbs since large difference of 2 potentials
5[V] is ideal EMF(electromotive force) of arduino UNO R3.
Since I stated &quot;ideal&quot; ,the actual EMF be slightly lower than 5[V].
In this instance , EMF can be assumed as voltage between GND and port of UNO R3 as ports are connected only by a wire.