A 21 Ohm rheostat is made of nickel wire. What is the length of the wire if its cross-sectional area is 0.5 A?
| November 27, 2020 | education
R = 21 Ohm S = 0.5 mm ρ = 0.42 Ohm * mm / m
L -?
From the formula: R = ρ * L / S we find L: L = R * S / ρ = 81 * 0.5 / 0.42 ≈ 96 m
Answer: the length is approximately 96 m
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