Question

Сопротивление нагревательного элемента электрического чайника R = 40 Ом. Определите работу и мощность тока, если питающее чайник напря- жение U = 220 В, а время работы чайника t = 4,0 мин.​

Answer 1

Ответ:

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Answer 2

Calculation of Work and Current Power

To determine the work and current power of the electric kettle, we need to use the formulas:

Work (W) = Voltage (U) * Current (I) * Time (t)

Power (P) = Voltage (U) * Current (I)

Given: Resistance of the heating element (R) = 40 Ω Voltage (U) = 220 V Time (t) = 4.0 min

To find the current (I), we can use Ohm's Law:

Current (I) = Voltage (U) / Resistance (R)

Let's calculate the current first:

Current (I) = 220 V / 40 Ω

Calculating the current:

Current (I) = 5.5 A

Now, we can calculate the work and power:

Work (W) = 220 V * 5.5 A * (4.0 min * 60 s/min)

Calculating the work:

Work (W) = 220 V * 5.5 A * 240 s

Work (W) = 290,400 J

Power (P) = 220 V * 5.5 A

Calculating the power:

Power (P) = 1,210 W

Therefore, the work of the electric kettle is 290,400 J, and the power of the current is 1,210 W.