Задача 30883.

A coil with a wound wire 20 m long and a cross-sectional area of 1 mm ^ 2 was connected to a current source with an EMF of 5.5 V and an internal resistance of 1 Ohm. A current of 0.5 A went through the circuit. Find: the specific resistance of the wire material; tension and current density in the wire; specific thermal power of the current in the wire.

Detailed solution with a short recording of the conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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