With a maximum resistance of the rheostat and a voltage across it of 6 V, the current through the rheostat is 0.4 liters.

univerkov | March 1, 2021 | education

With a maximum resistance of the rheostat and a voltage across it of 6 V, the current through the rheostat is 0.4 liters. How long is the constantan wire used to wind such a rheostat if the cross-sectional area of the wire is 0.3 mm2?

Solution: R = U / I = 6 / 0.4 = 15 Ohm,
R = p | / s,
I = RS / p = 0.3 / 0.5 = 9 m
Answer: 9 M

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