Question

Срочно помогите Десять одинаковых ламп накаливания, мощностью 60 Вт каждая, рассчитанные на напряжение 120 В, соединили параллельно и включили в сеть с напряжением 220 В. К этой конструкции подключили последовательно сопротивление. Если лампы горят нормально, то чему (в Омах) равно это дополнительное сопротивление?​

Answer 1

Ответ:

Требуемый ток для полного накала I=P/U1=60/120=0.5 A. Сопротивление лампы активное, R=U/I=120/0.5=240 Ом. При напряжении U2=220В и токе I полное сопротивление цепи должно быть Z=√(R²+Xc²)=220/0.5=440, найдем Xc=1/(2πf*C)=√(440²-R²)=368.8 Ом, тогда C=8.63*10^-6 Ф= 8.63.мкФ

Answer 2

Відповідь:

I=P/U=60/120=0,5A

ΔU=220-120=100В

R=100/0,5=200 Ом

Пояснення:

Answer 3

Calculation of Additional Resistance

To calculate the additional resistance in this circuit, we need to consider the total power consumed by the lamps and the voltage across them.

Given: - 10 identical incandescent lamps with a power rating of 60 W each - The lamps are designed for a voltage of 120 V - The lamps are connected in parallel and connected to a power supply with a voltage of 220 V - A resistance is connected in series with the lamps

To find the additional resistance, we can use the formula:

Additional Resistance = (Voltage across the lamps)^2 / (Total Power of the Lamps)

Let's calculate it step by step:

1. Calculate the total power of the lamps: - Each lamp has a power rating of 60 W. - Since there are 10 lamps, the total power consumed by the lamps is 10 * 60 W = 600 W.

2. Calculate the voltage across the lamps: - The lamps are connected in parallel, so the voltage across each lamp is the same as the power supply voltage, which is 220 V.

3. Calculate the additional resistance: - Using the formula mentioned above: Additional Resistance = (220 V)^2 / 600 W

Let's calculate the value:

Additional Resistance = (220 V)^2 / 600 W

Using a calculator, we find that the additional resistance is approximately 80.67 ohms.

Please note that the above calculation assumes that the lamps are ideal resistors and do not take into account any non-linear behavior or temperature effects.