Question

Реостаты сопротивлением 20, 30 и 50 Ом соединены последовательно. К ним приложено напряжение 120 В. Определите силу тока и напряжение на каждом реостате

Answer 1

Так R1=20 Ом,R2=30 Ом , R3=50 Ом,т.к.они присоединены последовательно,то на каждом реостате одинаковая сила тока !

i=U/R,Rобщее =20 +30+50=100 Ом ,i=120 /100=1.2 А ,то есть сила тока =1.2 А,

Напряжение следовательно на каждом реостате U1=R1*i=20*1.2=24 В,  U2=R2*i=30*1.2=36 В,U3=R3*i=50*1.2=60 В

Ответ:сила тока i=1.2 Ампер ,напряжение на каждом из трех реастатов ,соотвтственно равны U1=24 В ,U2=36 В,U3=60 В.

Answer 2

Calculation of Current and Voltage in Series Resistors

To determine the current and voltage across each resistor in a series circuit, we need to apply Ohm's Law and the rules for series circuits.

In a series circuit, the total resistance (R_total) is equal to the sum of the individual resistances (R1, R2, R3, etc.). The total current (I_total) flowing through the circuit is the same at all points.

Using Ohm's Law (V = I * R), we can calculate the current (I) flowing through the circuit and the voltage (V) across each resistor.

Given: - Resistance of the first resistor (R1) = 20 Ω - Resistance of the second resistor (R2) = 30 Ω - Resistance of the third resistor (R3) = 50 Ω - Applied voltage (V) = 120 V

Calculation:

1. Calculate the total resistance (R_total) in the circuit: - R_total = R1 + R2 + R3 - R_total = 20 Ω + 30 Ω + 50 Ω - R_total = 100 Ω

2. Calculate the total current (I_total) flowing through the circuit using Ohm's Law: - I_total = V / R_total - I_total = 120 V / 100 Ω - I_total = 1.2 A

3. Calculate the voltage (V1) across the first resistor (R1): - V1 = I_total * R1 - V1 = 1.2 A * 20 Ω - V1 = 24 V

4. Calculate the voltage (V2) across the second resistor (R2): - V2 = I_total * R2 - V2 = 1.2 A * 30 Ω - V2 = 36 V

5. Calculate the voltage (V3) across the third resistor (R3): - V3 = I_total * R3 - V3 = 1.2 A * 50 Ω - V3 = 60 V

Results:

The current flowing through the circuit is 1.2 A. The voltage across each resistor is as follows: - Voltage across the first resistor (R1) is 24 V. - Voltage across the second resistor (R2) is 36 V. - Voltage across the third resistor (R3) is 60 V.

Please note that these calculations assume an ideal circuit with no internal resistance or other factors that may affect the values.