Question

ЭДС источника тока 12 В. Когда к этому источнику подсоединении резистор с сопротивлением 5 Ом, в цепи начал течь ток 2 А. Какой ток будет течь, если к источнику подсоединить резистор сопротивлением 4 Ом?

Answer 1

Закон Ома для полной цепи I = E/(R+r), определим внутренне сопротивление источника  r = E/I - R = 12/2 - 5 = 1 ом

При включении другой нагрузки R1 = 4 ома

 I = E/(R1+r) = 12/(4+1) = 2,4 a

Answer 2

Calculation of Current in the Circuit

To calculate the current in the circuit, we can use Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.

Given: - The electromotive force (EMF) of the current source is 12 V. - The resistance of the first resistor is 5 Ω, and the current flowing through it is 2 A.

Using Ohm's Law, we can calculate the resistance of the first resistor (R1) as follows:

R1 = V1 / I1.

Substituting the given values, we have:

R1 = 12 V / 2 A = 6 Ω.

Now, we need to calculate the current flowing through the circuit when a second resistor with a resistance of 4 Ω is connected to the current source.

Using Ohm's Law again, we can calculate the current flowing through the circuit (I2) as follows:

I2 = V2 / R2.

Substituting the given values, we have:

I2 = 12 V / 4 Ω = 3 A.

Therefore, when a resistor with a resistance of 4 Ω is connected to the current source, the current flowing through the circuit will be 3 A.

Please let me know if you need any further assistance!