Ohms Law

[chipper]

Is there a good quality link somewhere that spells out all the colors on resistors ,(ring values) as according to ohm's law? I haven't looked yet but I know there is one , and it belongs somewhere on badcaps for references.

There is also a jingle that goes with ohm's law , and it relates to remembering , , remembering ohm's law :

better / be / right / or / your / great / big / venture /goes /wrong
silver = + or - 5
gold = + or - 10

better = blue (?? what order)
be = black(?? what order)
right = red
or = orange
your = yellow
great = green
big = brown (?? what order)
venture = violet
goes = gray
wrong = white

something like this ...

[chipper]

Re: Ohms Law

Ok , here it is :

http://s.maxthon.com/?q=resistor+value+chart

[gdement]

Re: Ohms Law

whenever I try reading those colors, I get them wrong. I can't tell the difference between some of them.

[stevo1210]

Re: Ohms Law

I saw that the thread was titled ohms law.... I thought this was going to be a physics lesson in electricity.

By the way, I failed an exam on ohms law not that long ago... and I learnt one new thing.... a graph for resistance which has a very slight bend also satisfies ohms law.

Anyway, I have issues reading those colour bands on the resistors as well.

[chipper]

Re: Ohms Law

I am trying to form a thread where we can all share experiences and theories on how to test these "rogue" type resistors that are perhaps old or unreadable. Best case senario is to form a method of meter testing , and apply it.

I am working on setting up some very simple metering devices that will positively identify or suggest bad caps or resistors , just for starters. But I want to have all of the tests revolve around a metering device that will show the exact results , where side by side comparisons can be performed , instead of guessed at or summized.

I guess if a resistor is unreadable , it's not a good idea to install it , if it's already on the board though , and obviously needs replacing , ohm's law is specifically important.

I hope this thread grows into a place where "resistors" and ohm's law can be discussed and implemented. Not to mention that some resistors are actually fuses.

[PCBONEZ]

Re: Ohms Law

I've come across resistors that were marked wrong in the first place so I always check with a meter too.

.

[Super Nade]

Re: Ohms Law

Always always check with a meter!

[Topcat]

Re: Ohms Law

better / be / right / or / your / great / big / venture /goes /wrong

No. This is the correct version:

Bad | Boys | Rape |Our | Young | Girls | But | Violet | Gives | Willingly

[Krankshaft]

Re: Ohms Law

.

Moving on here is a good one to get resistor values from the color bands just plug them in and you get a value and tolerance.

http://www.dannyg.com/examples/res2/resistor.htm

This is only for 5 band resistors. I do it in my head but this works too.

Sometimes especially on 1% tolerance resistors I have a problem with the colors too due to their blue body.

My grandfather was colorblind luckily I didn't inherit that but I still get confused from time to time .

On a related note I seem to remember some guy online claiming to be an electronics tech selling info on how to tell the value of a burnt resistor.

Is this even possible?

Usually I'd hope that a copy of the circuit was nearby and use the resistor value from there. Like the HV circuits on a LCD inverter or the resistors on a CRT projection TV supplying the STK ICs. Barring that time to find a service manual.

[kc8adu]

Re: Ohms Law

No. This is the correct version:

Bad | Boys | Rape |Our | Young | Girls | But | Violet | Gives | Willingly

that is the version i learned in the 70's
doubt you will hear that one in any school in this age of political correctness bullshit.

[arneson]

Re: Ohms Law

That's the one I had as well.
I have snapped a burnt resister in half,
measured whatever was left of it,
doubled that and went with it.
Carbon or wire wound, but only in non critacal applications.
Remember also that a resistor sub box can be your friend as can a small pot, when your unsure or designing stuff.

[chipper]

Re: Ohms Law

that is the version i learned in the 70's
doubt you will hear that one in any school in this age of political correctness bullshit.

It's all the same according to some left wing politically "appalled" types , but in the end they realize they are only at "A" in the dictionary , while they have been trying to cover some kind of unknown spectrum , in dismay.

When you tell them that you will hear some really nasty stuff , it's fun

[chipper]

Re: Ohms Law

.

Moving on here is a good one to get resistor values from the color bands just plug them in and you get a value and tolerance.

http://www.dannyg.com/examples/res2/resistor.htm

This is only for 5 band resistors. I do it in my head but this works too.

Sometimes especially on 1% tolerance resistors I have a problem with the colors too due to their blue body.

My grandfather was colorblind luckily I didn't inherit that but I still get confused from time to time .

On a related note I seem to remember some guy online claiming to be an electronics tech selling info on how to tell the value of a burnt resistor.

Is this even possible?

Usually I'd hope that a copy of the circuit was nearby and use the resistor value from there. Like the HV circuits on a LCD inverter or the resistors on a CRT projection TV supplying the STK ICs. Barring that time to find a service manual.

Yeah , 000ohms + - ? = 0

I have some electrical tape and some bits of hard flexible wire that I wanna test out on a rheostat controlled power supply. Please put on your safety visor prior to the application of voltage. ( attached to an infinity heatsink of course)

Usually , if I try to meter a resistor , and it doesn't show anything , I get a bigger power supply and try it till it gets really hot.

Damn , that was a "jumper" I just measured.