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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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31st Jan 2014, 12:24 am
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#1 |
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Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 951
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Resistor power rating
Ive found a load of old resistors out that are loose, I can of course get the resistance from the colour code, but not the power rating. Can anyone tell me a likely power rating based on size?
These are 10mm x 3.5mm Im looking through them because I need some rated 1W, however I suspect these might be lower?
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31st Jan 2014, 12:50 am
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#2 |
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Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: Resistor power rating
They sound, based on the size, like 0.5 W or maybe 1 W resistors.
Could you try a kamikaze test? Rig one up to an adjustable power supply, push a watt through it and wait and see what happens .....
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If I have seen further than others, it is because I was standing on a pile of failed experiments. |
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31st Jan 2014, 12:50 am
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#3 |
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Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Resistor power rating
Rating will depend on what type and how old. Something that size could be anything from 0.25W to maybe 0.6W.
A good picture would help with speculation.....
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
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31st Jan 2014, 10:14 am
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#4 |
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Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 951
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Re: Resistor power rating
Best picture I can manage at moment attached,
The more I ponder them, the more im thinking 1/2w As it turns out, I dont have any in the right values for the job im doing, but since I have thousands of 1/4w resistors, im just going to use those, but a lot more of them!
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I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com |
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7th Feb 2014, 3:37 pm
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#5 |
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Nonode
Join Date: Jan 2009
Location: Bristol, UK.
Posts: 2,062
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Re: Resistor power rating
From the picture, definitely not 1W !
They look similar to types I have in my spares box but I didn't get any original packaging either. I assumed 0.4 to 0.6 W so they went in with the 1/2 watt. Are they 5 band types at 1 or 2% ? dc Last edited by dave cox; 7th Feb 2014 at 3:38 pm. Reason: grammer |
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7th Feb 2014, 4:20 pm
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#6 |
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Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Resistor power rating
They're ½ watt rating. I have used those in the past. And I suggest you check their resistance. I have found some that although unused, have measured out-of-tolerance to a large degree.
Al. |
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