Question

3. При напряжении 270 В сила тока в цепи-100 мА. Какая сила тока будет в цепи, если напряжение уменьшить до 150 В?

Answer 1

Ответ:

55.55mA

Объяснение

I1/I2=U1/U2 I2=150*100/270=55.55 mA

Answer 2

Calculating Current in the Circuit

To calculate the current in the circuit when the voltage is reduced to 150 V from 270 V, we can use Ohm's law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them. The formula for Ohm's law is:

I = V / R

Where: - I = current in the circuit (in amperes, A) - V = voltage across the circuit (in volts, V) - R = resistance in the circuit (in ohms, Ω)

Applying Ohm's Law

Given: - Initial voltage (V1) = 270 V - Initial current (I1) = 100 mA = 0.1 A - Final voltage (V2) = 150 V

We can use the formula to find the resistance (R) in the circuit: R = V1 / I1

Then, we can use the obtained resistance to calculate the current (I2) when the voltage is reduced to 150 V: I2 = V2 / R

Calculation

1. Calculate the resistance (R): - R = V1 / I1 - R = 270 V / 0.1 A - R = 2700 Ω

2. Calculate the current (I2) when the voltage is reduced to 150 V: - I2 = V2 / R - I2 = 150 V / 2700 Ω - I2 ≈ 0.056 A

Conclusion

When the voltage is reduced to 150 V, the current in the circuit will be approximately 0.056 A.