Задача 31253.

Electric range with 1 kW Nichrome spiral is designed to supply power to the voltage of 220 V. How many meters of wire 0.5 mm in diameter must be taken for the manufacture of spiral thread if the temperature is 900 ° C? The resistivity of nichrome at 0 ° C 1 mO • m, and the temperature coefficient of resistance of 0.4 x 10^-3 K^-1.

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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