I've been learning how to use the Arduino Uno using the "Arduino Starter Kit". The kit comes with LEDs and resistors and tells you what power of resistor you need to pair with which LED. The same is true for other components, for example: what capacitor to pair with the servo motor.
But how do you tell if you just go and pick up a brand new (or maybe a used) servo? Or when you purchase new LEDs, or have some hanging around from older projects, how do you know how much resistance they need to be paired with?
Thanks so much!