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 Resistor Composition Type

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_JD_

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Join date : 2010-10-14
Location : Kenilworth, NJ U.S.A.

PostSubject: Resistor Composition Type   Mon Oct 18, 2010 8:54 pm

Hi, I have 2 of these; 120 ohm resistors and don't know for sure what type or wattage & tolerance they are. By the size I say there power resistors. Anyone recognize em? Band colors BROWN/RED/BROWN/RED/WHITE. Baked on enamel with vent holes on each end. White is 10%T but the Red before it got me.TIA _JD_



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smeezekitty

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Join date : 2010-10-12
Location : Washington/USA

PostSubject: Re: Resistor Composition Type   Mon Oct 18, 2010 8:57 pm

1 or 2 watt metal oxide.
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FrankB



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PostSubject: Re: Resistor Composition Type   Tue Oct 19, 2010 3:44 pm

Depending on the mfg. they could either be 1 or 2 watt types- (The different mfg had different sizes for the same wattage resistors- typically RCA and NTE, -- I found that some 2 watt were the same size physically as 1 watt.); and they are 2% tol.
FrankB
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Radiosmoker

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PostSubject: Re: Resistor Composition Type   Thu Oct 21, 2010 4:55 pm

From Wikipedia

5-band axial resistors
5-band identification is used for higher precision (lower tolerance) resistors (1%, 0.5%, 0.25%, 0.1%), to specify a third significant digit. The first three bands represent the significant digits, the fourth is the multiplier, and the fifth is the tolerance. Five-band resistors with a gold or silver 4th band are sometimes encountered, generally on older or specialized resistors. The 4th band is the tolerance and the 5th the temperature coefficient.

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