Copper and iron wires of equal length and the same cross-section are connected in series in the circuit. Which of them will release more heat at the same time?
A larger amount of heat will be released in the iron wire at the same time, because the electrical resistivity of iron is greater than that of copper, therefore, with the same cross-sectional length, the resistance of the iron wire will be greater, and the current strength in series connection is the same.
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