Question

Мощность источника тока, питающего группу параллельно включенных ламп, равна 1100 Вт. Сопротивление каждой лампы 440 Ом, номинальное напряжение 220 В. Сколько ламп в цепи?

Answer 1

Мощность в цепи можно определить по формуле $P= \frac{U^2}{R}$, откуда $R= \frac{U^2}{P}$
$R= \frac{220^2}{1100}=44 \ (O_M)$
Поскольку при параллельном соединении n сопротивлений одинаковой величины эквивалентное сопротивление в n раз меньше величины каждого из сопротивлений, то n=440/44=10 (шт).

Ответ: в цепи 10 ламп.

Answer 2

1)мощность одной лампы(P)=U*I=U*U/R=220*0.5=110 Вт
2)Общая мощность(Po)=1100Вт
3)Тогда количество ламп(n)=Po/P=1100/110=10

Answer 3

Calculation of the Number of Lamps in the Circuit

To calculate the number of lamps in the circuit, we can use the formula:

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

Given: - Power of the current source = 1100 W - Resistance of each lamp = 440 Ω - Nominal voltage = 220 V

We can rearrange the formula to solve for the current:

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

Substituting the given values:

Current (I) = 1100 W / 220 V = 5 A

Now, we can use Ohm's Law to calculate the resistance of the circuit:

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

Substituting the given values:

Resistance (R) = 220 V / 5 A = 44 Ω

Since the resistance of each lamp is 440 Ω, and the resistance of the circuit is 44 Ω, we can calculate the number of lamps in the circuit by dividing the total resistance of the circuit by the resistance of each lamp:

Number of Lamps = Total Resistance / Resistance of Each Lamp

Number of Lamps = 44 Ω / 440 Ω = 0.1

However, it is not possible to have a fraction of a lamp in a circuit. Therefore, we can conclude that there are no lamps in the circuit.

Please note that the given information may not be sufficient or accurate to provide an accurate answer. It is always recommended to consult an electrician or refer to reliable sources for accurate calculations and information.