Question

какова мощность, потребляемая фехралевой проволокой сечением 0,5 мм^2 и длиной 4 м, если она подключена к источнику тока напряжением 120В?

Answer 1

Найдём сопротивление проводника:
R=p*l/S
R=1.3*10^-6*4/0,5*10^-6=10.4(Ом)
Найдём мощность:
P=U^2/R
P=1385(Вт) или 1,385 кВт

Answer 2

Calculation of Power Consumed by the FeCrAl Wire

To calculate the power consumed by the FeCrAl wire, we need to use the formula:

Power (P) = Voltage (V) x Current (I)

Given: - Voltage (V) = 120V - Wire length (L) = 4m - Wire cross-sectional area (A) = 0.5 mm^2

To find the current (I), we can use Ohm's Law:

Current (I) = Voltage (V) / Resistance (R)

The resistance (R) of the wire can be calculated using the formula:

Resistance (R) = Resistivity (ρ) x Length (L) / Cross-sectional area (A)

The resistivity (ρ) of the FeCrAl wire is not provided in the question, so we cannot calculate the exact power consumed. However, we can provide the steps to calculate it once the resistivity is known.

Steps to Calculate the Power Consumed:

1. Find the resistivity (ρ) of the FeCrAl wire. The resistivity is a material property and can be obtained from reliable sources or by conducting experiments. 2. Calculate the resistance (R) of the wire using the formula: Resistance (R) = Resistivity (ρ) x Length (L) / Cross-sectional area (A). 3. Calculate the current (I) flowing through the wire using Ohm's Law: Current (I) = Voltage (V) / Resistance (R). 4. Finally, calculate the power (P) consumed by the wire using the formula: Power (P) = Voltage (V) x Current (I).

Please note that without the resistivity value of the FeCrAl wire, we cannot provide an accurate calculation of the power consumed.