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Calculate the resistance of the steel rod and the copper wire R_material resistivity-of-material * Length / Area The steel rod and the copper wire are now two resistors in series whose total resistance is the sum of both, that is R_total R_steel + R_copper Use ohm's law to calculate the potential with R_total and the current provided in the problem Potential (Volts) Current * R_total The instantaneous power in the rod is calculated as Power Potential x Current And the energy dissipated in the copper and steel is then Energy Dissipated Power x Time Plug in the numbers and you are good.
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