2006-07-07 22:07:12 · 10 answers · asked by Anonymous in Consumer Electronics ➔ Other - Electronics
A much more reliable technique is to hold it up to the light, and you'll see two metal pieces inside, one of them a lot larger than the other. The lead that's attached to the larger of the two is connected to the negative (and hence, the smaller of the two is connected to the negative).
But always, ALWAYS connect an LED to a battery via a resistor!
And getting the connections the right way around is essential - at best it won't light and at worst you'll blow the LED up.
2006-07-13 01:13:56 · answer #1 · answered by BryanIRL 2 · 1⤊ 0⤋
A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when electrically biased in the forward direction. This effect is a form of electroluminescence. The color of the emitted light depends on the chemical composition of the semiconducting material used
Normally if the Pin-Out is large/long it is Positive. other ways to ditinguish to the polaritires are :
if an wire is red ma\eans it is +ve .. black means it is -ve
2006-07-07 22:21:23 · answer #2 · answered by vamsi krishna 2 · 0⤊ 0⤋
Banderes is wrong! LEDs are diodes and, hence, pass current only one way. Long is positive (anode)... short is negative (cathode). LEDs must have a series resistor to limit current. Whenever connected to AC, an LED must have another diode in series with it to protect it from high reverse voltage.
2006-07-07 22:20:57 · answer #3 · answered by Mr. Peachy® 7 · 0⤊ 0⤋
On LED, long wire is connected to positive.
LED polarity is
sign: + â
polarity: positivenegative
terminal: anode cathode
wiring: red black
pinout: long short
interior: small large
shape: round flat
marking: none stripe
2006-07-07 22:20:59 · answer #4 · answered by Vj. 2 · 0⤊ 0⤋
Oym not sure, but oy can tell ya doe, down't put da two wires on to one wire. Oy ded dis an almost kilt moiself. Oy tink ya can put da one wire on one soid an da udder on de udder soid. you shud do dis durrin a power cut, oy ded it wen der woz no power cut, an oy near kilt moiself agen. Any way wot da foc es a emitin doyode?
2006-07-07 22:41:08 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Long one is connected to positive :)
2006-07-07 22:40:41 · answer #6 · answered by rahul 1 · 0⤊ 0⤋
Since its a LED it dont matter mate!
It only has to pass current to light up,
(i mean it isnt a capacitor etc etc)
2006-07-07 22:10:06 · answer #7 · answered by Banderes 4 · 0⤊ 0⤋
either way dude it works ,enjoy the lights
2006-07-07 22:23:02 · answer #8 · answered by mc 2 · 0⤊ 0⤋
either way round is fine, it makes no difference.
2006-07-07 22:18:15 · answer #9 · answered by Anonymous · 0⤊ 0⤋
it doesn't matter either will do
2006-07-07 22:23:18 · answer #10 · answered by fred t 2 · 0⤊ 0⤋