Question

Цепь состоит из двух спиралей по 8 Ом каждая,источника тока с ЭДС 30В и сопротивлением 1 Ом. Определите ток в цепи.

Answer 1

R1=R2=8 Ом I=E/(R+r)
1) При последовательном соединении R=2*R1
I=30/(2*8+1)=1,76 A
2) При параллельном соединении R=R1/2
I=30/(4+1)=6 A

Answer 2

Calculating Current in the Circuit

To calculate the current in the circuit, we can use Ohm's law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them. The formula for Ohm's law is:

I = V / R

Where: - I = current in the circuit - V = voltage across the circuit - R = total resistance in the circuit

In this case, the circuit consists of two parallel resistors, each with a resistance of 8 Ohms, and a voltage source with an electromotive force (EMF) of 30V and a resistance of 1 Ohm.

Calculation Steps

1. Calculate the total resistance (Rt) of the parallel resistors using the formula for resistors in parallel: 1 / Rt = 1 / R1 + 1 / R2 where R1 = R2 = 8 Ohms

2. Once the total resistance (Rt) is calculated, use Ohm's law to find the current (I) in the circuit: I = V / Rt where V = 30V

Calculation

1. Calculating the total resistance (Rt) of the parallel resistors: 1 / Rt = 1 / 8 + 1 / 8 1 / Rt = 1 / 8 + 1 / 8 = 1 / 4 Rt = 4 Ohms

2. Using Ohm's law to find the current (I) in the circuit: I = 30V / 4 Ohms I = 7.5A

So, the current in the circuit is 7.5 Amperes.