The spiral is made of nichrome. wire with a cross-sectional area of 1mm ^ 2. What is the length of this wire
| September 1, 2021 | education
The spiral is made of nichrome. wire with a cross-sectional area of 1mm ^ 2. What is the length of this wire if, with a current of 0.6 A, the voltage across the coil is 15 V?
Initial data: S (cross-sectional area of nichrome wire) = 1 mm2; I (current in the spiral) = 0.6 A; U (coil voltage) = 15 V.
Constants: ρ (resistivity of nichrome) = 1.1 Ohm * mm2 / m.
The length of the nichrome wire from which the spiral was made is determined from the formulas: R = ρ * l / S = U / I, whence l = U * S / (ρ * I).
Calculation: l = 15 * 1 / (1.1 * 0.6) = 22.73 m.
Answer: The spiral is made of nichrome wire 22.73 m long.
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