Cho mạch điện như hình vẽ, cho biết: R1 = 4; R2 = R5 = 20; R3 = R6 = 12; R4 = R7 = 8; UAB = 48V. a) Tìm điện trở tương đương R AB của đoạn mạch. b) Tìm cường độ dòng điện chạy qua các điện trở.

Các câu hỏi liên quan

V.Choose the correct form of the verb in the following sentences. 1. Neither Bill nor Mary (is/are) going to the play tonight. 2. Anything (is/are) better than going to another movie tonight. 3. Skating (is/are) becoming more and more popular everyday. 4. A number of reporters (was/were) at the conference yesterday. 5. Everybody who (has/have) a fever must go home immediately. 6. John, along with twenty friends, (is/are) planning a party. 7. The picture of the soldiers (Bring/brings) back many memories. 8. The quality of these recordings (is/are) not very good. 9. If the duties of these officers (isn’t/aren’t) reduced, there will not be enough time to finish the project. 10. The effects of cigarette smoking (have/has) been proven to be extremely harmful. 11. Your glasses (was/were) on the bureau last night. 12. There (was/were) some people at the meeting last night. 13. The committee (has/have) already reached a decision. 14. A pair of jeans (was/were) in the washing machine this morning. 15. Each student (has/have) answered the first three questions. 16. The use of credit cards in place of cash (have/has) increased rapidly in recent years. 17. Advertisements on television (is/are) becoming more competitive than ever before. 18. Mr. Jones, accompanied by members of the committee, (have/has) proposed some changes of the rules. 19. Living expenses in this country, as well as in many others, (is/are) at an all-time high. 20. The levels of intoxication (vary/varies) from subject to subject.