why does an led have to be given a resistor before it Answered
if a device draws only its required amount of current from a supply,. then why does an led have to be given a resistor before it? wont it just take 20 mA from a 3 volt 5 amp power supply?
i checked many instrctables for it but couldnt find a proper explanation for my answer so i thought of asking it..
and people say that led should not be directly connected to any supply as it may blow or get damaged or burn..
but i have done that many times and also had made a torch for my uncle using two white leds of 3.5v( not sure but they are big) and used a 9 v battery without any resistor...it lasted till the battery drained but never blasted... and yes its in series..
and thanks in advance for answering me.. and sorry for bad image quality..used my phone