Đoạn mạch AB gồm hai điện trở R1 =8 và R2 =12 mắc song song. Đặt hiệu điện thế U = 24 V không đổi giữa hai đầu đoạn mạch AB. a. Tính điện trở tương đương của đoạn mạch AB và cường độ dòng điện chạy qua các điện trở. b. Tính công suất tiêu thụ của đoạn mạch AB, công của dòng điện sản ra ở toàn đoạn mạch trong 12 phút. c. Điện trở R1 làm bằng dây dẫn có điện trở suất 0,5.10-6 m, tiết diện 0,6 mm2. Tính chiều dài của dây dẫn này. d. Mắc thêm vào mạch một điện trở R3 = 5Ω nối tiếp với R1. Tính cường độ dòng điện mạch chính.

Giúp mình làm câu hỏi này ạ .MÌnh cảm ơn rất nhiều ạ

II. Rewrite each sentence so that it has the same meaning as the first one. (1.0pt) 1. There is not a Math class today. We don’t ____________________________________________________________________ 2. Let’s listen to some rap music now. Why don’t ___________________________________________________________________ 3. Lan learns Maths very well. Lan is very good ______________________________________________________________ 4. English is easy to learn. English is not _________________________________________________________________

Writing : A famous person. Viết về Newton nha, bỏ qua phần tuổi ạ ! Viết đơn giản thôi nha vì em mưới lớp 3 thôi ạ !! Mng giúp em với ajj !!!

Vẽ Mầm Dỗi Nl:Học Trễ cũg Có Lý Do Chứ 😕

các anh chị giúp me với, em cảm ơn nhiều

gíup mình câu này với, tối nay mình phải nộp

Ex4. Complete the second sentence so it means the same as the first. Use the word in brackets. ONLY write your answers! 29.1. I predict a victory for our team. (win) (1 Point) I think __________________________. Enter your answer 30.2. The sky is blue. It’ll be sunny all afternoon. (not rain) (1 Point) The sky is blue. It ____________________ rain this afternoon. Enter your answer 31.3. Meet me outside the station at 5 pm. (meet) (1 Point) I _________________________ you outside the station at 5 pm. Enter your answer 32.4. What time is the school concert on Friday? (start) (1 Point) What time _______________________ on Friday? Enter your answer

"Can i meet you at 4.30 tomorrow afternoon?" Minh asked Phuong. Chuyển sang câu gián tiếp

A. But that isn't the end of the story. B. This kind of information is very useful for certain people. C. Why not use the energy created by pedestrians instead? D. However, one big problem could be cost. E. And it's actually based on a simple idea. F. This is especially true when it's been used in very busy areas. G. But it soon became clear that this might not work. H. This new system should work even better. Ever since the 19th century, when people were developing different ways of creating electricity, companies have looked for improved ways of producing power, using cleaner and more efficient methods. Now a UK company called Pavegen has been working on technology that could be widely used in the future to produce electricity. ____ The company has developed a special type of floor, made of square tiles. Underneath each square, there's a system that can produce a certain amount of electricity very cheaply from the energy created every time someone steps on it! The creator of the floor, Laurence Kemball-Cook, came up with the idea when he was a student, and did some work experience with an energy company. The company asked him to investigate ways of providing street lighting in city centres, using energy from the sun to produce electricity. _____One reason was that many city centres don't get enough sunlight, because of all the tall buildings. Then he thought of a better plan. ____ The right technology could be used to convert this energy into electricity right under people's feet! The design of the floor is actually extremely effective. _____ And the reason is that a lot of energy is produced simply because of the large numbers of people walking across the floor. In fact, the special squares are already in place in several locations with high numbers of pedestrians. These include big department stores and also an airport. The Flooring can have other uses too, such as recording how many people visit a shopping centre at particular times. _____ For example, shop owners in the centre would be interested in knowing at which times of days they have the highest customer numbers. So the next time you visit a big shopping centre, have a careful look at the floor that you're walking across!