Question

10 БАЛЛОВ! Удельное электрическое сопротивление меди 0,017 мкОм * м. Чему равно электрическое сопротивление медной проволоки площадью поперечного сечения 1 мм2 и длинной 100м ? ПОЛНОЕ РЕШЕНИЕ ПОЖАЛУЙСТА! ХОРОШО ОЦЕНЮ!

Answer 1

Дано:
p=0,017 мкОм*м=1,7*10⁻⁸ Ом*м
l=100 м
s=1 мм²=10⁻⁶ м²
R=?
R=pl/s R=1,7*10⁻⁸*100/10⁻⁶=1,7 (Ом)

Answer 2

Calculation of Electrical Resistance

To calculate the electrical resistance of a copper wire with a cross-sectional area of 1 mm² and a length of 100 m, we can use the formula:

Resistance = (Resistivity * Length) / Area

Given that the resistivity of copper is 0.017 μΩ * m, the length is 100 m, and the area is 1 mm² (which is equivalent to 0.000001 m²), we can substitute these values into the formula to find the electrical resistance.

Resistance = (0.017 μΩ * m * 100 m) / 0.000001 m²

Simplifying the equation:

Resistance = (0.017 * 100) / 0.000001 Ω

Resistance = 1.7 Ω

Therefore, the electrical resistance of the copper wire with a cross-sectional area of 1 mm² and a length of 100 m is 1.7 Ω.

Please note that the resistivity value of 0.017 μΩ * m for copper is commonly used, but it may vary slightly depending on the purity and temperature of the copper.