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Лампа через удлинитель включена в сеть напряжением 220 В и горит под напряжением 210 В. Какое количество теплоты выделится в подводных проводах за 8 часов работы лампы, если суммарная длина проводов от лампы до электролинии 70 м? Провода сделаны из меди, площадь сечения составляет 2 мм2.

Упражнение 1 Переписать предложение, подчеркнуть сказуемое,

определить и написать время в предложении.

Пример: Joe has crashed his car three times since Christmas.- Present Perfect

1 He often cuts himself.

2 What time did John arrive?

3 I never forget anything.

4 Are you sitting comfortably?

5 We drank a lot of Coke at the party.

6 It was raining all night.

7 The train will leave in a few minutes.

8 I put on a clean shirt yesterday.

9 I drive home from work every day.

10 What did you eat for dinner?

11 I’m driving from work.

12 My brother lives in Chicago.

13 I have never been to space.

14 We’re having a great time on vacation.

15 I’m thinking about taking a trip around the world.

16 I have travelled the world.

17 He will have been eating his pizza.

18 I was recording a class for Youtube when you called.

19 Kate has met the President.

20 What are you doing now?

21 The sky is blue.

22 I watch the TV.

23 How many hours do you work a week?

24 He has worked here for 5 years.

25 We have been in a relationship for three months.

26 She has already written 40 books.

27 Mother will bath the baby in a small tub.