I am getting ready for my lab tomorrow and one of the questions is this: ok, here's what I think: since current flows from anode to cathode and in first case LED's anode is connected to the pull-up resistor, so there's current through it and it's going to light. In second case, wouldn't it burn? since there's no resistance between the LED and the source and LED's have little resistance, so it's going to shine brighter? If i am wrong could you please explain? i doubt i got this right. Thanks in advance. ps: we have not put the circuit together yet, so it's hard for me to visualize.