Question

Расчитайте площадь поперечного сечения стального провода 200 м, если при напряжении 120 В сила тока в нем 1,5 А

Answer 1

Дано:
L = 200 м
U = 120 В
I = 1,5 А
р = 0,15 Ом × мм²/м
Найти: S - ?
Решение:
R = U/I
R = pL/S
U/I = pL/S
S = IpL/U
S = (1,5 А × 0,15 Ом × мм²/м × 200 м)/120 В  = 0,375 мм²

Answer 2

Calculating the Cross-Sectional Area of the Steel Wire

To calculate the cross-sectional area (S) of the steel wire, we can use the formula S = R * L / ρ, where R is the resistance, L is the length, and ρ is the resistivity. The resistance (R) can be calculated using the formula R = U / I, where U is the voltage and I is the current.

Given: - Length (L) = 200 m - Voltage (U) = 120 V - Current (I) = 1.5 A

First, let's calculate the resistance (R) using the formula R = U / I: R = U / I R = 120 V / 1.5 A R = 80 ohms

Now, we can calculate the cross-sectional area (S) using the formula S = R * L / ρ. However, the resistivity (ρ) of the steel wire is not provided in the search results. Therefore, it's not possible to calculate the cross-sectional area without the value of resistivity (ρ).

Unfortunately, the search results do not provide the necessary information about the resistivity of the steel wire, so it's not possible to calculate the cross-sectional area based on the given information.

If you have the value of the resistivity (ρ) of the steel wire, please provide it, and I can help you calculate the cross-sectional area using the given length, voltage, and current.