Question

В электрическую цепь напряжением 120 В включены последовательно три резистора сопротивлением 3,9 и 12 Ом . сила тока в цепи равна:5 А,4 А,10 А,3 А

Answer 1

Ответом задачи является 5А .

Answer 2

Calculation of Current in the Circuit

To calculate the current in the circuit, we need to use Ohm's Law, which states that the current flowing through a conductor is equal to the voltage across the conductor divided by the resistance of the conductor.

In this case, the circuit consists of three resistors connected in series, with resistances of 3.9 Ω, 12 Ω, and 12 Ω. The total resistance in a series circuit is the sum of the individual resistances.

Let's calculate the total resistance of the circuit:

Total resistance = 3.9 Ω + 12 Ω + 12 Ω = 27.9 Ω

Now, we can calculate the current using Ohm's Law:

Current = Voltage / Resistance

Given that the voltage is 120 V, we can substitute the values into the formula:

Current = 120 V / 27.9 Ω

Calculating the current:

Current ≈ 4.30 A

Therefore, the current in the circuit is approximately 4.30 A.

Please note that the calculated value is an approximation due to rounding.