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Thread: resistor wattage ID?

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    resistor wattage ID?

    I'm not sure where to post this, but can some one here take a look at my resistors and tell if they are both 1/2 watt?
    I know the one on the left is 1/2 watt, but the one on the right is a little smaller, and has thinner leads. Thanks.Click image for larger version. 

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    There's no way to know 100% without any other info. There are even mini resistors now that look much smaller than typical counterparts, but have the same wattage rating. That said, if you know that the one on the left is 1/2 watt, I'd be relatively certain that the one on the right is also. If in doubt, install it and monitor it for heat.

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    Thanks dude. I don't rember buying any quarter watt resisters but the size had me worried

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    Yeah, check out Vishay PR01 series. 2 watt resistors, tiny.

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    Quote Originally Posted by mikepukmel View Post
    Yeah, check out Vishay PR01 series. 2 watt resistors, tiny.
    I ordered a few values of the PR01 (02?) series 1W resistors. I have to keep them away from my bulk resistor assortment, because I'll confuse them for 1/4W! I feel dizzy whenever I thumb through them

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    Yeah I ordered some of those 1 watt resistors too. I thought they accidentally put 1/4 watt in my order or something. Kinda makes you a bit nervous using them.

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    With metal film and metal oxide resistors there can be confusion but those of carbon film (I refer to modern ones) usually maintain the proportions of physical volume and dissipation capacity.
    So, if one of them is half a watt, the other should be too. The different thickness of the pins does not indicate much by itself. There is a tendency in those of Asian origin to have them thinner.
    The 1-watt carbon film resistors from Tayda for example (very thin pins) should be used with caution regarding mechanical assembly. In certain applications I do not use them.

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    What bothers me about the little ones is that voltage rating usually is better with more surface area (edit: I mean length).
    So where a small part with a high wattage rating may be fine for SS equipment, it is often not as good in high voltage applications.

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    Last edited by g1; 09-02-2019 at 12:44 AM.
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    voltage rating usually is better with more surface area.
    I don't think that surface matters regarding voltage rating. Rather it would be materials and creepage/clearance distances. Always best to check manufacturers' datasheets.

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    I should have said length instead of surface area. More distance is always better for voltage withstand ratings, even in air.

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    I bought some of the Vishay PR01 series 82K and 100 K for driver plate resistors but was surprised at the small size so I've never used them.
    Good thing, because they're only rated at 350V whereas the regular old carbon film types are 500V.

    https://music-electronics-forum.com/...1&d=1567386302

    https://music-electronics-forum.com/...1&d=1567386302
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