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Author Topic: Resistor colour codes ( and other useful info)  (Read 184 times)

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Offline Railwaygun

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Resistor colour codes ( and other useful info)
« on: March 25, 2020, 08:49:04 PM »
resistor colour coding
This has been a public service announcement
It may contain alternative facts

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Offline njee20

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Re: Resistor colour codes ( and other useful info)
« Reply #1 on: March 25, 2020, 09:30:39 PM »
I freely admit to not being able to remember the colour bands any more, so I just Google, where images has millions of colour charts.

Offline ntpntpntp

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Re: Resistor colour codes ( and other useful info)
« Reply #2 on: March 25, 2020, 09:37:21 PM »
This link also has tables for  3-band, 4-band, 5-band, and 6-band coding.   4-band are by far the most common nowadays but I've certainly used 5-band resistors in the past.

https://www.electronicshub.org/resistor-color-code
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Offline Dorsetmike

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Re: Resistor colour codes ( and other useful info)
« Reply #3 on: March 25, 2020, 10:27:08 PM »
Having taught it many times over the years in the RAF and industry It has stuck as have the mnemonic rhymes to aid he memory, some not suitable for a family forum.
Cheers MIKE
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Online Bealman

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Re: Resistor colour codes ( and other useful info)
« Reply #4 on: March 25, 2020, 10:37:22 PM »
Yeah, I think we've been through this before somewhere on the forum. The colour codes are often hard to read anyway on the blue background colour.

In all the projects published by Silicon Chip may, they always recommend checking the value with your DDM before soldering them in place.

I do this as a matter of course because of my pathetic eyesight.
Vision over visibility. Bono, U2.

Offline jpendle

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Re: Resistor colour codes ( and other useful info)
« Reply #5 on: March 25, 2020, 10:41:54 PM »
I'm proud to say that in the finest traditions of British higher education we were neither taught resistor colour codes nor how to solder when I did my Electronics Degree at the University of Liverpool in the early 80's. I think the assumption was that 'there would be someone to do that for you', yeah right!

Thankfully with the advent of SMT in the early 90's colour codes went away and specialist soldering tools became necessary for assembly and rework, so my lack of practical skills remained a secret  :D.

Nowadays I'm lucky if I can even see some of the parts on a PCB, let alone read what's on them!

I always measure the resistance on a multimeter before using a resistor these days  ;D

John P
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Offline sprogman

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Re: Resistor colour codes ( and other useful info)
« Reply #6 on: March 26, 2020, 02:37:09 PM »
I'm proud to say that in the finest traditions of British higher education we were neither taught resistor colour codes nor how to solder when I did my Electronics Degree at the University of Liverpool in the early 80's. I think the assumption was that 'there would be someone to do that for you', yeah right!

I was that person :)

When I did my degree at Hull in the early 80's I was staggered at the number who couldn't already solder! Also the number who had zero previous experience of Electronics.

Offline ntpntpntp

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Re: Resistor colour codes ( and other useful info)
« Reply #7 on: March 26, 2020, 02:40:36 PM »
@mods - wonder if @Railwaygun intended this topic to be kept to a factual list of useful links rather than descending into a chat?
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!

Offline Railwaygun

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Re: Resistor colour codes ( and other useful info)
« Reply #8 on: March 26, 2020, 08:28:35 PM »
@mods - wonder if @Railwaygun intended this topic to be kept to a factual list of useful links rather than descending into a chat?

lets see how it develops! i can always do some weeding..
This has been a public service announcement
It may contain alternative facts

Caveat lector

The largest Railwaygun, Armoured Train & Military Rail group in the world!
https://groups.io/g/railwaygun/topics

My Military Rail Pinterest area
https://uk.pinterest.com/NDRobotnik/

10mm / N armour Threads
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Motto: Semper ubi, sub ubi

Online Bealman

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Re: Resistor colour codes ( and other useful info)
« Reply #9 on: March 26, 2020, 09:43:33 PM »
Yeah, I thought I'd leave that post for you, as it's your thread! I'm finding some of the chat interesting, actually!
Vision over visibility. Bono, U2.

Offline Dorsetmike

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Re: Resistor colour codes ( and other useful info)
« Reply #10 on: March 26, 2020, 09:55:55 PM »
Easy way of remembering ohms law relationships between volts amps and ohms, note the positions in the triangle give you what you need to do either multiplication or division; calculations must be done in volts, amps and ohms, if you have say 25 milliamps you need to enter 0.025 amps, or say 3 megohms then 3,000,000



To find Volts if you know Current in amps and resistance in ohms  V=IxR
 "    " current "  "      "     Volts, and resistance in ohms                 I= V/R
 "    " Resistance "    "     Volts and current in amps                       R= V/I

Similar for Power in Watts, relationship with volts and current in amps



To find Watts W=VxI, to find Current W/V, to find volts V=W/I
« Last Edit: March 26, 2020, 10:04:01 PM by Dorsetmike »
Cheers MIKE
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Offline themadhippy

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Re: Resistor colour codes ( and other useful info)
« Reply #11 on: March 26, 2020, 11:06:23 PM »
And if you  combine both the triangles you get  a circle.


Online Bealman

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Re: Resistor colour codes ( and other useful info)
« Reply #12 on: March 26, 2020, 11:10:21 PM »
Yeah, that's a good 'in  :thumbsup:
Vision over visibility. Bono, U2.

 

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