1/8 w resistor for 12v?
I bought one radio shack led with built-in 1/8w 680ohm resistors to see how it was made.
I read the 1/8w resistor wouldn't work and it would burn up? Using something like 1/2w would be better.
I tested it with a 9v battery and I didn't feel it getting hotter. Maybe just warm?
I got some LEDs off ebay many years ago and I have no idea what their specs are.
They are 3mm led bulbs.
I decided to make my own by using 5 1/8w 150ohms resistors. 150 ohms are the only resistors I have on hand.
With the combined resistance of 750 ohms, how much voltage is going to the LED?
Will I be fine with just using 4 150 ohms resistors?
Will is be dangerous to use the 1/8w resistors? I don't want a fire.
Will having more resistors also help spread out the heat among the resistors?
I drive 4 hours a day, so the light will only be on for that duration.