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Practical situation.

If I have 0.25W of constant Joule loss around a small piece of copper electric conductor, then I would like to find out how much time until a small piece of "Something" (let's say 100mg at 1 kJ/kg*K) around the conductor heats up to 200°C.

From my calculations, the necessary heat will be Q = Specific heat of the Something (?) * mass of "Something" * (200°C - ambient temp).

So the amount of time to heat this up is supposed to be Q/0.25W. Am I right?

Or is there any other delay or heat loss that won't go into heating the "Something" to 200C? :shy: