amen!amen!nguoi hay giup con

D

duing

lonely_girl_sad said:
cho mach dien r,l,c
r thay doi duoc.U=100can2 cos100#t
L=1.4/2#(F)

C=10^-4/2#(F)

xac dinh r de :a,cong suat cua mach dien P=80w
b,cong suat cua toan mach cuc dai.tinh gja tri do.
(trong do #=3.14)
Bấm để xem đầy đủ nội dung ...
ZL=.. ZC=..
P=U^2*R/[R^2 +(ZL+ZC)^2]
thay vao giai pt bac 2 la ra
2.
nhan ca tu va mau vs 1/R =>mau tro thanh :R+(ZL+ZC)^2/R
de Pmax <=>mau min ap dung bdt cosi
=>R^2=(ZL-ZC)^2 thay vao la duoc
dung nho thank nha:D:D:D:D
 
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L

lonely_girl_sad

hjhj
kam on pan
nhju nhju lam.hjjhj
eo mjh vui wa.
hjhj.ma sao o tren thi zl+zc ma o duoi cau b thi lạ zl -zc nak.hjnh nhu o tren kug la zl -zc ma
 
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