For a project I am working on I needed a few extra resistors so I strolled down to my local Radio Shack and asked for a small pack of resistors with the ohm number that I was using in project.
Well the guy handed me a pack and it was cheap enough so I paid and I was on my way home.
As it turns out these resistors were the right ohm but the Watts was .5 and so since i am a noob I thought that was okay. Needless to say they did not work.
SO since I know the ohm number what Watt should i have been aware of? My Arduino box which had the original resistors did not have that piece of information documented.
Anyway, thanks for any help with this little learning curve. LOL
It is OK to have it too high, but bad to have it too low.
Unless you are working with power circuitry, or heavy loads, then it's pointless going for anything over 0.25W.
The actual power is defined by VI, or RI², or V²/R.
At 5V a 100? resistor would dissipate 5²/100 = (5*5)/100 = 25/100 = 0.25W.
A bigger resistance dissipates less power, a smaller one more power.
The power rating won't "stop" a resistor from working. If the power rating is too low, the resistor will get too hot, and in the worst case, catch fire.
Either the resistors you were sold were the wrong resistance, or you asked for the wrong resistance, or you have wired them up wrong.
I am just playing with LEDs nothing power hungry. No, I have not burned up anything...yet! LOL
The resistors from Radio Shack are .5 Watts and the ohms were dead on but they did not work. When I pulled on of my originals and replaced it it worked perfectly so I assumed (maybe I was wrong in that) the .5 Watts caused my LEDs to not light up.
I will check out what you suggested Terry. I would rather have a large cheap supply than pay $5 for a very small store quantity.
ubotbuddy:
Not that I can tell. It's a Pantech I got from Verizon.
I'd be mildly surprised if it was made in the last several years and doesn't have a macro setting, even if the way to change the scene setting isn't obvious. This is a bit of a digression from the main topic, but you might want to look it up in your phone's product manual (Pantech's Tech Support page if you need it). If your phone does have a macro setting it will prove a useful feature for similar occasions in the future. While professional level macro photography is a bit too much to expect out of smartphone camera, a macro setting does often allow clear close-up shots of small things.
ubotbuddy:
Thanks Far-seeker I'll check it out and see if some tweaks can help out my close-ups.
Buddy
If you don't have a macro setting, sometimes taking the picture thru a magnifying glass will work well. Set up the lens so you don't have to hold it and the camera at the same time, then focus on the image from the lens. I have a desk lamp with such a lens that works wonderfully for this on an old Kodak DC3200 I used to use.
The one on the left is from Radio Shack and it says 10kohm 1/4 Watt.
You were saying that you got 0.5W resistors earlier in the thread?
If one of those resistors work and the other dosn't then you are not connecting them in correctly. Are you using solder less bread board? Check the wire ends for stickty deposits from the tape that held them.
get these: