Question

ЭДС источника равнв 12В внутреннее сопротивление 2 Ом сила тока равна 2А найти внешнее сопротивление?

Answer 1

I = ЭДС/R + r

Выражаем отсюда R

R = (ЭДС/I) - r = (12 В/ 2А) - 2 Ом = 4 Ом

Answer 2

из формулы Закона Ома для полной цепи

R= E/I-r

R=12/2-2=4

Answer 3

Calculation of External Resistance

To find the external resistance in this circuit, we can use Ohm's Law, which states that the current flowing through a circuit is equal to the electromotive force (EMF) divided by the total resistance. The formula is:

I = E / (R + r)

Where: - I is the current flowing through the circuit, - E is the electromotive force (voltage) of the source, - R is the external resistance, and - r is the internal resistance of the source.

In this case, the EMF of the source is 12V, the internal resistance is 2Ω, and the current is 2A. We need to find the external resistance (R).

Substituting the given values into the formula, we have:

2A = 12V / (R + 2Ω)

Simplifying the equation, we can solve for R:

2A * (R + 2Ω) = 12V

2A * R + 4Ω = 12V

2A * R = 12V - 4Ω

2A * R = 8V

R = 8V / 2A

R = 4Ω

Therefore, the external resistance in this circuit is 4Ω.