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WTF resistors

I just got a back of about 130 resistors for a bag of 50 L.E.D's but some of the resistors ive never heard of, there are a few like 100ohm and 560 ohm but now im getting 1m ohm and 4.1Mohm and 100K ohm,1.5K ohm and 1K ohm. Ive never seen resistors like this before, i am very basic in electronics but i took a class at school have have made many many projects but never resistors like this and i only wanted to use them for a few L.E.D's, I dont really know what im asking for in here but i just sapose if anyone has any help or ideas or really anything with these resistors and matching them with L.E.D'S?

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Sandisk1duo8 years ago
the resistors that you got are for multiple purposes, there are millions upon millions of different values of resistors, each limits a different amount of power
Why resistors are used?I didn't really understand.
Resistors resist the flow of electrical current. If you would connect an LED to a 9 volt battery, it would die very quickly. However, if you put the correct resistor in there was well, it would allow the LED to burn for many hundreds or even thousands of hours.

I hope that makes sense. It's very basic.

Here is more on resistors if you want to read it:
http://www.explainthatstuff.com/resistors.html
LemonSlice8 years ago
I don't understand exactly why we need resistors for LEDs. I can use LEDs fine without resistors and I can't see anything happening to them.
their life will be drastically reduced. Here's an analogy for you: you are shooting a machine gun at somebody "what? they're still alive.... (for now!!!!)" you are shooting someone with a nerf gun, they're going to stay alive for a lot lot lot longer until they die of old age (about 100,000 hours for an LED) bad analogy? I know
That makes sense, even though the analogy doesn't. Shouldn't the analogy be like if you shoot someone, they die quicker than if you shoot them while they are wearing kevlar. In that case, the kevlar would be the resistor. Does the resistor lower the current? Because I would understand if the un-reduced current burns out the LED quicker.
Redneck28 years ago
Where did you get your resistors?
craig3 (author)  Redneck28 years ago
in an Australian store called disk smith
ledzep5679 years ago
hmm does anyone know a link to a more thorough calculator? i have several resistors with 2 gold bands, and more then 4 bands also some with no bands
craig3 (author)  ledzep5679 years ago
the ones with 2 gold bands range from 1ohm to 9.9 ohms
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