L.E.D has one leg longer then the other one, the longer one is positive and the smaller one is negative. If you have a l.e.d which has same length of legs then look inside the l.e.d for two kind of triangle peices and one of them will be smaller which is positive and one which is bigger and is negative.
Current will only flow one way through an LED, so it has a positive leg and a negative leg. One of them is longer to signify which is which (longer is negative). The negative side also has a chamfered edge on the LED itself.
the negative leg is shorter than the positive leg.
The length of the legs. The positive leg is always longer than the negative one.
On an LED, one leg will be shorter than the other. The shorter leg is the negative polarity.
Cathode (negative) is the shortest leg and there is a flat edge on the base of the LED, and it must be connected to the negative wire or "-" connection. Anode (positive) is the longest leg, and must be connected to the positive wire or "+" connection, as electricity will only pass through a LED from positive to negative.
Anode and cathode. Anode = negative lead, cathode = positive lead.
The longest leg is the positive leg of any LED.
A leg is a limb, it is neither positive or negative.
because the negative leg is shorter.
If you plug it it in, if it doesn't light it's the wrong way round. Although these other two are more 'conventional': -The negative wire is closest to a small flat 'spot' on the LED's base. -The longer leg is the positive wire
The long leg of the LED is the Anode. Connecting the Anode to the negative end of the dry cell would bias the LED off. It would not illuminate. It may also destroy LED.
Look at the size of the 'flags' inside the LED lens itself. The bigger one is the positive one. Don't ask me about a bi/tri colour LED, maybe with a capacitor.