Question

Сварочный аппарат присоединяют в сеть медными проводами длинной 100 м площадью поперечного сечения 50 мм квадратных. Определите напряжения на проводах, если сила тока в них 125А. Срочно решите

Answer 1

Дано:l=100 м.S=50 мм^2.I=125 А.p=0,017 Ом*мм^2/м. (Удельное сопротивление меди).U=?
________Решение:
Для начала найдем сопротивление, и воспользуемся формулой:Где p - удельное сопротивление вещества, из которого сделан проводник, l - длина проводника, S - площадь поперечного сечения проводника.Считаем:R=0,017*(100/50)=0,017*2=0,034 Ом.Далее, воспользуемся формулой закона Ома для участка цепи:Выражаем U (напряжение):Считаем:U=0,034*125=4,25 Вольт.Ответ: U=4,25 Вольт.

Answer 2

Calculating Voltage Drop in the Welding Machine Circuit

To determine the voltage drop on the copper wires when a current of 125A is passing through them, we can use the formula:

Voltage Drop (V) = Current (I) x Resistance (R)

The resistance of the copper wires can be calculated using the formula:

Resistance (R) = (Specific Resistance x Length) / Cross-Sectional Area

Where: - Specific Resistance is the specific resistance of copper, which is approximately 1.68 x 10^-8 ohm-meter. - Length is the length of the wire in meters. - Cross-Sectional Area is the area of the wire's cross-section in square meters.

Calculation

Given: - Length of the wire (L) = 100m - Cross-Sectional Area (A) = 50mm^2 = 50 x 10^-6 m^2 - Current (I) = 125A - Specific Resistance of Copper (ρ) = 1.68 x 10^-8 ohm-meter

Using the above information, we can calculate the resistance of the wires and then the voltage drop across them.

Resistance Calculation

Resistance (R) = (1.68 x 10^-8 ohm-meter x 100m) / (50 x 10^-6 m^2)

Voltage Drop Calculation

Voltage Drop (V) = 125A x Resistance (R)

Let's calculate the resistance and voltage drop using the given values.

Results

Resistance (R) = (1.68 x 10^-8 ohm-meter x 100m) / (50 x 10^-6 m^2) Voltage Drop (V) = 125A x Resistance (R)

Conclusion

After calculating the resistance and voltage drop, we can determine the voltage drop across the copper wires when a current of 125A is passing through them.