Hai điện trở R1= R2=20om mắc nối tiếp. Biết hiệu điện thế hai đầu mạch điện làm 40V. Tính điện trở tương đương cả mạch điện và cường độ dòng điện qua mỗi điện trở

Các câu hỏi liên quan

Bài 1: 1. A lot of toys encourage children’s_________. (imagine) 2. The factory has provided cheaper__________ lately. (produce) 3. Burning coal is an _______ way of heating a house. Gas is much cheaper. (economy) 4. According to some scientists the earth is losing its outer atmosphere because of_____. ( pollute) 5. She has one of the biggest art________ in Britain. ( collect) 6. __________ has caused many so-called man-made disasters. (forest) 7. __________ often walk through the streets shouting or singing about something they sell. (cry) 8. Gas and oil________ always increases in cold weather. (consume) 9. The police are interested in the sudden________ of the valuable painting. (appear) 10. Both competitors are ______ strong and fast. (surprise) 11. A large number of car accidents are caused by fast and _____driving. (care) 12. Could you send me details of courses for _______, who have never learnt English before. (begin) 13. Ba's family and Liz had a very ________ day in the countryside last weekend. (enjoy) Bài 2 If you want a truly(1) ........................................................... holiday , book with us now! We (memory) can offer you a (2) ..................................................... service that no other company can. (person) Our expert staff will provide you with useful (3) .................................................... about all (inform) of the (4) ................................ buildings and areas that you can visit. On some (history) excursions, for a small (5) ................................................. change, we can even provide (add) you with your own individual guide. A trip with us will give you an insight into the (6) ................................................................. of the region. We try to make sure (cultural) that nothing is (7) ............................................................ in order to make your trip a (miss) (8) .................................................... one that you will talk about for ages. We have (marvel) something to offer both those (9) ..................................................... for a peaceful time (look) taking it easy, and more (10) ............................................... people looking for the (energy) adventure of a lifetime.