Tổng công suất:

P= 700+200+2×6

P= 1020(w)

Cường độ dòng điện:

I= P/U=1020=220~4,64(A) a) Chọn Aptomat tổng: 6 A (lớn hơn dòng điện tính toán). b) Tiết diện dây dẫn mạch chính: khoảng 1 mm² (hoặc chọn 1,5 mm² để đảm bảo an toàn).

- Cấu tạo ampe kìm: gồm kìm kẹp (lõi sắt từ), cuộn dây đo, mạch đo và màn hình hiển thị. - Cách sử dụng: chọn thang đo dòng điện, kẹp ampe kìm vào một dây dẫn cần đo (không kẹp cả hai dây), đọc giá trị dòng điện hiển thị trên màn hình.

Topic 3

Last year my school had a school trip. We went to the Military History Museum and Ao Vua Park in Ha Noi. We went by bus in the morning. I felt very happy and excited. At the museum I saw many pictures of history. I learned about brave soldiers. My teacher talked and we listened. My friends and I walked together and played simple games. After lunch we went to Ao Vua Park. We got tickets and played many fun games. The trip was very fun and I loved it. I will always remember this trip with my lovely classmates.

1.→ It has been a few years since I moved to this neighbourhood. 2. → While I was waiting for my food, I noticed a nice painting on the wall.

1. → This is the first time I have made mooncakes for the Mid-Autumn Festival. 2. → I had a desire to explore the hidden gems of the city that most tourists miss. 3. → Bao wishes he had a big house.