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It's OK to use a resistor with higher wattage than spec, just not lower wattage. The manufacturer may have run out of the lower rated ones on that run.
As to "insulated resistors," notice that the kind we are more used to from the 1940's on don't have their resistance element exposed but have a cylindrical case on which are the color bands of the code. The old dog bones with the wire wrapped lead on each end were just chunks of resistance rod painted, thus not really "insulated." I suspect that's where the term came from.
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Reece
Perfection is hard to reach with a screwdriver.
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11-01-2011, 06:42 AM
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