Đề kiểm tra 15p Vật lí lớp 9 - Năm học 2016-2017 - Trường THCS Hòa Bình

Họ và tờn :......................................
Lớp : ..............................................
Điểm
Trường THCS Hũa Bỡnh 
Ngày.thỏngnăm 2016
Bài kiểm tra vật lí 9
Thời gian 15 phỳt 
Kớ duyệt
Lời phờ của cụ giỏo 
Tổ c/m
BGH
Đề bài
Cho mạch điện AB gồm cú hai điện trở R1 và R2 mắc song song ; ampe kế A đo cường độ dũng điện trong mạch; ampe kế A1 đo cường độ dũng điện chạy qua R1.
1, Vẽ sơ đồ mạch điện.
2,Biết : R1= 6Ω; R2 = 10Ω; ampe kế A chỉ 1,2A. Hóy tớnh:
Hiệu điện thế của đoạn mạch
Số chỉ ampe kế A1
3, Giữ nguyờn hiệu điện thế của đoạn mạch và mắc thờm vào đoạn mạch điện trở R3 sao cho R1// R2// R3 . Biết cường độ dũng điện trong mạch tăng thờm 0,3A, tớnh R3 ?
BÀI LÀM
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