Question

Дана электрическая цепь, которая состоит из источника питания, сопротивления нагрузки и выключателя. Напряжение сети составляет 120 В, внутреннее сопротивление равно 2 Ом., сопротивление нагрузки 4 Ом. Найти ток в электрической цепи.

Answer 1

По закону Ома для полной цепи сразу находим:
I = ЭДС / (R+r) = 120 / (4+2) = 120 / 6 = 20 A

Answer 2

Electric Circuit Analysis

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

In this case, the electric circuit consists of a power source, a load resistance, and a switch. The voltage of the power source is 120 V, and it has an internal resistance of 2 Ω. The load resistance is 4 Ω.

To find the current in the circuit, we can use the formula:

I = V / (R_source + R_load)

where: - I is the current in the circuit, - V is the voltage of the power source, - R_source is the internal resistance of the power source, and - R_load is the resistance of the load.

Substituting the given values into the formula, we have:

I = 120 V / (2 Ω + 4 Ω)

Calculating the expression:

I = 120 V / 6 Ω

Simplifying the expression:

I = 20 A

Therefore, the current in the electric circuit is 20 A.