Question

4. Яку роботу виконує електричний струм за 4 хвилини, якщо за напруги 60 В сила струму в двигуні 3 А? Яка потужність двигуна? ​

Answer 1

Ответ:

A=U*I*t=60*3*4*60=43 200 Дж=43,2 кДж;

P=U*I=60*3=180 Вт.

Answer 2

Calculation of Work Done by Electric Current

To calculate the work done by an electric current, we need to know the voltage (V) and the current (I) flowing through the circuit, as well as the time (t) for which the current flows.

In this case, we are given the voltage (V = 60 V) and the current (I = 3 A) in the motor for a duration of 4 minutes.

To calculate the work done (W), we can use the formula:

W = V * I * t

Substituting the given values:

W = 60 V * 3 A * 4 min

Conversion of Time Units

Before calculating the work done, let's convert the time from minutes to seconds, as the SI unit for time is seconds.

1 minute = 60 seconds

Therefore, 4 minutes = 4 * 60 = 240 seconds.

Now, we can proceed with the calculation.

Calculation of Work Done

W = 60 V * 3 A * 240 s

Simplifying the equation:

W = 43200 J

Therefore, the work done by the electric current in the motor over a duration of 4 minutes is 43200 Joules.

Calculation of Power

To calculate the power (P) of the motor, we can use the formula:

P = W / t

where W is the work done and t is the time.

Substituting the values:

P = 43200 J / 240 s

Simplifying the equation:

P = 180 W

Therefore, the power of the motor is 180 Watts.