exemoel :10w 20Rj what Rj means? is there anyone who can refer where I can buy 3w + 30kohms cement resistors or higher value for example 40kohms but 3w or what I can I use instead if I can not find
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Wirewound Cement Resistor Ceramic explanation
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Re: Wirewound Cement Resistor Ceramic explanation
10W = 10 watts (ceramic block)
20 = ohms
R = Resistor, or the decimal point
j = 5% tolerance.
So no, the 30KΩ resistors won't be the same thing. You could get two 10Ω 5W resistors and stick in series.
Incidentally I don't see much use for a 10W 20KΩ+ resistor these days in modern consumer electronics... You'd need hundreds of volts to dissipate that much power to need a resistor that big and it's indeed just wasting that power. Vacuum tube circuits (including CRTs)!? All bets are off.Last edited by eccerr0r; 01-03-2022, 08:03 PM.
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Re: Wirewound Cement Resistor Ceramic explanation
All power resistors will be ceramic. Pretty much everything else has a risk of melting or immolating. I already gave you one option if you can't find the exact value, but they too will be ceramic.
I don't know what sources you have available locally. I'm sure mouser or digikey will have exact replacement units.
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Re: Wirewound Cement Resistor Ceramic explanation
Modern resistors and capacitors follow the EIA standard for values. Example is the EIA-12 is twelve values for the decade, used for parts that have +/-10% tolerance: 100, 120, 150, 180, 220, 270, 330, 390, 470, 560, 680, 820
In that your 30k woud be closest to 27k or 33k, and 40k closest to 39k.
Next is for +/-5% EIA-24 values for the decade: 100, 110, 120, 130, 150, 160, 180, 200, 220, 240, 270, 300, 330, 360, 390, 430, 470, 510, 560, 620, 680, 750, 820, 910.
But it would be still hard to find 40k at several watts, they are not popular and not a standard value really.
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Re: Wirewound Cement Resistor Ceramic explanation
Originally posted by bohaboha View PostWhat I need should be 3w and +30k
https://www.mouser.com/c/passive-com...nce=30%20kOhms
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