Question

Электрочайник имеет в нагревателе две секции. При включении первой секции вода в чайнике закипает за время t1 =10 мин, а при включении второй секции – за время t2 =40 мин. Через какое время закипит вода, если включить обе секции параллельно или последовательно.

Answer 1

Время, через которое закипит вода, пропорционально мощности секций.
При параллельном соединении (1/t) = (1/10) + (1/40) = 5/40.
Время равно (40/5) = 8 минут.

При последовательном соединении t = 10 + 40 = 50 минут.

Answer 2

Calculation of Water Boiling Time

To calculate the time it takes for the water to boil when both sections of the electric kettle are turned on, we need to consider whether they are connected in parallel or in series.

Parallel Connection: When the sections are connected in parallel, they both heat up simultaneously. In this case, the time it takes for the water to boil will be determined by the section that takes longer to boil. So, the boiling time will be equal to the longer boiling time between the two sections, which is t2 = 40 minutes.

Series Connection: When the sections are connected in series, the water passes through the first section and then through the second section. In this case, the boiling time will be the sum of the boiling times of both sections. Therefore, the boiling time will be t1 + t2 = 10 minutes + 40 minutes = 50 minutes.

To summarize: - When the sections are connected in parallel, the boiling time is t2 = 40 minutes. - When the sections are connected in series, the boiling time is t1 + t2 = 10 minutes + 40 minutes = 50 minutes.

Please note that these calculations assume that the heating elements in both sections are equally efficient and that there are no other factors affecting the boiling time.