Question

По медному проводнику с поперечным сечением 3,5 мм2 и длиной 14,2 м идет ток силой 2,25 А. Определите напряжение на концах этого проводника. Удельное сопротивление меди 0,017 Ом•мм2/м.

Answer 1

Имеем, 
R=pl/s, тогда по закону Ома находим:
U=IR=Ipl/s

p-удельное сопротивление. 

Answer 2

Calculation of Voltage on the Ends of the Copper Conductor

To determine the voltage on the ends of the copper conductor, we can use Ohm's Law, which states that the voltage (V) is equal to the product of the current (I) and the resistance (R). The resistance of the conductor can be calculated using the formula:

R = (ρ * L) / A

Where: - R is the resistance of the conductor, - ρ is the resistivity of copper (0.017 Ω·mm²/m), - L is the length of the conductor (14.2 m), - A is the cross-sectional area of the conductor (3.5 mm²).

Let's calculate the resistance first:

R = (0.017 Ω·mm²/m * 14.2 m) / 3.5 mm²

Using the given values, we can calculate the resistance of the copper conductor.

R = (0.017 Ω·mm²/m * 14.2 m) / 3.5 mm² = 0.0688 Ω

Now, we can calculate the voltage using Ohm's Law:

V = I * R

Substituting the given values:

V = 2.25 A * 0.0688 Ω = 0.1548 V

Therefore, the voltage on the ends of the copper conductor is approximately 0.1548 V.

Please note that the calculated value is an approximation and may vary slightly due to rounding errors.