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Re: Help replace dead hotend heater (Ohm's Law and Rated Wattage)

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Ohms law is actually the very definition of resistance (measured in ohms). Generally speaking "laws" may have exceptions or corner cases, but measurement units not so much.

The power in watts, with an resistive load, it gets dissipated as heat. This is the effective / real heat dissipation.

The markings on the resistors, like "14W", those are "ratings". If effective dissipation and/or temp is higher than rating, then should expect the life of the resistor to be much shorter.

Most likely cemented resistors used for hotend will fail pretty fast, so imo those in picture are not good for such practical use.

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