Question

СРОЧНО!!!!! Нагревательный элемент сопротивлением 100 Ом выделил 12 МДж теплоты за 20 мин. Какова сила тока в цепи?

Answer 1

Q = I2Rt.=12МДж =12*10 в 6 степени.
I2 = Q\Rt  I = корень квадратный из Q\Rt
12*10 в 6 степени\100*1200 = 1200 А.

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:

V = I * R

Where: - V = voltage across the conductor - I = current flowing through the conductor - R = resistance of the conductor

We can rearrange the formula to solve for the current (I):

I = V / R

Given: - Resistance (R) = 100 Ω - Energy (E) = 12 MJ (12 * 10^6 J) - Time (t) = 20 min = 1200 s

We can use the formula for power (P) to find the voltage (V) across the resistor:

P = E / t

Let's calculate the power and then use it to find the current in the circuit.

Calculating Power

The power (P) can be calculated using the formula:

P = E / t

Substituting the given values: P = 12 * 10^6 J / 1200 s

Calculating: P = 10,000 W

Calculating Voltage

The power (P) can also be expressed as: P = V * I

Rearranging the formula to solve for voltage (V): V = P / I

Calculating Current

Using Ohm's law: I = V / R

Substituting the values of V and R: I = (10,000 W) / (100 Ω)

Calculating: I = 100 A

Answer

The current in the circuit is 100 A.