508A microcontroller can deliver a maximum of 25mA

A typical device that requires less than 5v and draws less than 25mA is an LED. A LED must be supplied with an exact voltage for it to operate correctly. Because it requires LESS than 5v, a dropper resistor (current limiting resistor) must be included in series to `take-up` or `absorb` or `interface` the LED to the output line. Working out the value of the current-limiting resistor requires some mathematics but this is very easy when you know how.

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