Question

10. К источнику тока с ЭДС 9 В и внутренним сопротивлением 1,5 Ом присоединена цепь, состоящая из двух проводников по 20 Ом каждый, соединенных между собой параллельно, и третьего проводника сопротивлением 3,5 Ом, присоединенного последовательно к двум первым. Чему равна сила тока в неразветвленной части и напряжение на концах цепи?

Answer 1

I=9В/(1,5+(20/2)+3,5)Ом=9/15А=0,6А

 

Answer 2

Calculation of Current and Voltage in the Circuit

To calculate the current and voltage in the given circuit, we need to apply the principles of Ohm's law and Kirchhoff's laws.

Given information: - The circuit is connected to a source with an electromotive force (EMF) of 9 V and an internal resistance of 1.5 Ω. - The circuit consists of two parallel conductors, each with a resistance of 20 Ω, connected in parallel to each other. - There is a third conductor with a resistance of 3.5 Ω connected in series to the first two conductors.

To find the current in the unbranched part of the circuit, we can use Ohm's law, which states that the current (I) flowing through a conductor is equal to the voltage (V) across the conductor divided by its resistance (R):

I = V / R

Let's calculate the current in the unbranched part of the circuit:

1. Calculate the total resistance of the parallel conductors: - The resistance of each parallel conductor is 20 Ω. - The total resistance of parallel resistors can be calculated using the formula: 1 / R_total = 1 / R1 + 1 / R2 - Substituting the values, we get: 1 / R_total = 1 / 20 + 1 / 20 1 / R_total = 2 / 20 1 / R_total = 1 / 10 R_total = 10 Ω

2. Calculate the total resistance of the circuit: - The total resistance of the circuit can be calculated by adding the resistance of the third conductor in series to the total resistance of the parallel conductors: Total resistance = R_total + R3 Total resistance = 10 Ω + 3.5 Ω Total resistance = 13.5 Ω

3. Calculate the current in the unbranched part of the circuit: - Using Ohm's law, we can calculate the current: I = V / R I = 9 V / 13.5 Ω I ≈ 0.67 A

Now, let's calculate the voltage across the ends of the circuit.

4. Calculate the voltage across the ends of the circuit: - The voltage across the ends of the circuit can be calculated using Kirchhoff's voltage law, which states that the sum of the voltages in a closed loop is equal to zero. - Since the circuit is a series circuit, the voltage across the ends of the circuit is equal to the EMF of the source: Voltage = EMF = 9 V

Answer:

The current in the unbranched part of the circuit is approximately 0.67 A, and the voltage across the ends of the circuit is 9 V.

Please note that the calculations provided are based on the given information and assumptions.