Question

Измеренное омметром значение электрического сопротивления лампы накаливания 40 Ом. Паспортные номинальное рабочее напряжение U ном и номинальная мощность P ном, указанные на лампе, равны соответственно 220 В и 100 Вт. Зная измеренные и паспортные параметры лампы, рассчитать мощность, потребляемую лампой, при включении к источнику питания с напряжением, равным ее номинальному напряжению. Пояснить полученные результаты. нужно очень срочно!!!!

Answer 1

Im = U / R = 220 В / 40 Ом = 5,5 А
Pm = Im * U = 220 В * 5,5 А = 1210 Вт , но затем по мере нагревания спирали лампы эта мощность падает до 100 Вт

Answer 2

Calculation of Power Consumed by the Incandescent Lamp

To calculate the power consumed by the incandescent lamp when connected to a power source with a voltage equal to its nominal voltage, we can use the formula:

Power (P) = Voltage (U) squared / Resistance (R)

Given that the measured resistance of the lamp is 40 Ω and the nominal voltage is 220 V, we can substitute these values into the formula to calculate the power consumed.

Power (P) = (220 V)^2 / 40 Ω

Let's calculate the power consumed by the lamp:

Power (P) = (220 V)^2 / 40 Ω = 48400 V^2 / 40 Ω = 1210 W

Therefore, the power consumed by the incandescent lamp when connected to a power source with a voltage equal to its nominal voltage is 1210 W.

Explanation of the Results

The power consumed by the incandescent lamp is calculated using the formula P = U^2 / R, where P is the power, U is the voltage, and R is the resistance. This formula is derived from Ohm's law, which states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance.

In this case, the measured resistance of the lamp is 40 Ω, and the nominal voltage is 220 V. By substituting these values into the formula, we can calculate the power consumed by the lamp.

The power consumed by the lamp is 1210 W, which indicates the rate at which the lamp converts electrical energy into light and heat. This value is higher than the nominal power of the lamp, which is 100 W. The difference between the measured power and the nominal power can be attributed to factors such as variations in the resistance of the lamp due to temperature changes and manufacturing tolerances.

It's important to note that incandescent lamps are known for their inefficiency, as a significant portion of the electrical energy is converted into heat rather than light. This is why incandescent lamps have been phased out in many countries in favor of more energy-efficient alternatives, such as LED lamps.

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