Question

К источнику с ЭДС 12В и внутренним сопротивлением 1 Ом подключен реостат., сопротивление которого 5 Ом. Найти силу тока в цепи и напряжение на зажимах источника.

Answer 1

I=E/(R+r)=12/(5+1)=2 A   U=I*R=2*5=10 В

Answer 2

Calculation of Current and Voltage

To find the current and voltage in the circuit, we need to consider the given values:

- The electromotive force (EMF) of the source is 12V. - The internal resistance of the source is 1Ω. - The resistance of the rheostat is 5Ω.

Let's calculate the current and voltage in the circuit.

The total resistance in the circuit can be calculated by adding the internal resistance of the source and the resistance of the rheostat:

Total Resistance (R_total) = Internal Resistance + Rheostat Resistance

R_total = 1Ω + 5Ω = 6Ω

The current in the circuit can be calculated using Ohm's Law:

Current (I) = EMF / Total Resistance

I = 12V / 6Ω = 2A

Therefore, the current in the circuit is 2A.

To find the voltage across the source, we can use Ohm's Law again:

Voltage (V_source) = EMF - (Current * Internal Resistance)

V_source = 12V - (2A * 1Ω) = 10V

Therefore, the voltage across the source is 10V.

Conclusion

In the given circuit with an EMF of 12V and an internal resistance of 1Ω, connected to a rheostat with a resistance of 5Ω, the current in the circuit is 2A and the voltage across the source is 10V.