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What is the wattage rating of a resistor?

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What is the wattage rating of a resistor?

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Carbon resistors, for example, are commonly made in wattage ratings of 1/8 (0.125)W, 1/4 (0.250)W, 1/2 (0.5)W, 1W, and 2 Watts. Generally speaking the larger their physical size the higher its wattage rating.

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