Question

В электроприборе под напряжением 10 В 45 минут протекал ток 5 А. Какую работу он совершил?. Какова мощность этого электроприбора?

Answer 1

A=I*U*t=5*10*45*60=135 000 Дж
P=I*U=5*10=50 Вт

Answer 2

Calculation of Work Done

To calculate the work done by an electrical device, we can use the formula:

Work (W) = Voltage (V) x Current (I) x Time (t)

In this case, the voltage is 10 V, the current is 5 A, and the time is 45 minutes. However, we need to convert the time from minutes to seconds before performing the calculation.

Converting 45 minutes to seconds: 45 minutes x 60 seconds/minute = 2700 seconds

Now we can calculate the work done: Work (W) = 10 V x 5 A x 2700 s

Let's calculate the work:

Work (W) = 10 V x 5 A x 2700 s = 135,000 Joules

Therefore, the electrical device has done 135,000 Joules of work.

Calculation of Power

Power is the rate at which work is done or energy is transferred. It can be calculated using the formula:

Power (P) = Work (W) / Time (t)

In this case, we already know the work done (135,000 Joules) and the time (45 minutes or 2700 seconds). Let's calculate the power:

Power (P) = 135,000 J / 2700 s

Power (P) = 50 Watts

Therefore, the power of this electrical device is 50 Watts.