Hi, it's stupid questions time=)
I didn't upload any program to the Arduino Uno board. It's used only as a power source
I have two schemas, they have difference only in LEDs count
First: 5V pin => 220 OHM resistor => push button => LED => ground pin
Second: 5V pin => 220 OHM resistor => push button => 1 LED => 2 LED => ground pin
In the second schema LEDs' bright less intensive than LED bright in the first.
Both schemas have the same voltage and resistance, so the current should be also the same.
Why than LEDs' brightness is less in the second schema? Does it depend not only on current?