Things like diodes and transistors need resistors while things like motors and ics don't need resistors. How can I find out if something needs a resistor or not? Whenever I look at data sheets I see the max current. I don't know whether this is the max current it will draw without a resistor or if it is the max current that can sadly pass through it. Where in the data sheets can I find out if it needs a resistor or not?