После разгрузки баржи ещё осадка в реке уменьшилась на 60 см.определить массу снятого с неё груза, если площадь сечения баржи на уровне воды равна 240 м квадратных

Мощность электрического тока:

            P = U·I, где U - напряжение на нагрузке, В

                                I - сила тока в цепи, А

Тогда при I₁ = 4·I

            P₁ = U · 4·I = 4·U·I = 4·P

Если рассмотреть подробнее:

Сила тока в цепи при неизменном напряжении будет возрастать только при уменьшении сопротивления цепи (например, при подключении параллельно дополнительной нагрузки). В этом случае:

          I = U/R    =>   I₁ = U/R₁ = U/(R:4) = 4 U/R = 4·I    

То есть, во сколько раз уменьшится сопротивление, во столько же раз увеличится сила тока и, следовательно, мощность электрического тока.

ответ: при увеличении силы тока в 4 раза и неизменном

           напряжении мощность тока в цепи также

           возрастет в 4 раза.  

My weekday

I get up at 6:45. I jump out of bed, turn on the radio and do morning exercises to the music of the radio. Then I go to the bathroom, wash my face and brush my teeth with a toothbrush. It will not take me much time, no more than ten or fifteen minutes. Then I get dressed and sit down at the table to have breakfast. I usually have a cup of tea or coffee, an egg and bread and butter.

After breakfast, I go to college. Since I live far away, I ride the bus or metro. I need more time to ride the bus. If I have little time, I ride the subway. My lessons begin at 9 o’clock. We have six lessons every day. At a quarter to one we have a lunch break.

Since I cannot return home for lunch, I take it in the dining room of our college.

For lunch, I have meat or fish with potatoes and a cup of strong tea or coffee with cake. At ten minutes to three lessons have ended, and I am going home. When I get home from college, I have dinner. My dinner usually consists of three dishes.

For the first course, I have some soup, then some meat or fish. For dessert, I put out fruit or ice cream. After lunch, I help my mom wash the dishes. Then I do my homework. It usually takes me about two hours.

At eight or nine o’clock I have dinner. I have a salad, a slice of sausage and bread, yogurt or cereal.

In the evening I listen to the radio or watch TV. If the program is not interesting, I go to the cinema or to the theater. Sometimes I go for a walk with friends. We talk about different things and usually have a good time.

At 11 o'clock I go to sleep.