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A 12 ohm resistor with 12 V across it will dissipate 12 watts.

To determine the temperature of the resistor, you need more information. The resistor and 12 V supply could be inside an oven, in which case it would be very hot, or in Antarctica, in which case it would be very cold.

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Q: What will a 12 ohm resistors temperature be when 12 volt is applied?
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