Upload
khoidayvangduong
View
213
Download
0
Embed Size (px)
DESCRIPTION
aeg
Citation preview
1, Mot bep ien khi hoat ong bnh thng co ien tr R = 60 va cng o dong
ien qua bep khi o la 2A.
a).Tnh nhiet lng ma bep toa ra trong 1s.
b)Dung bep ien tren e un soi 0,75l nc co nhiet o ban au la 35oC th thi gian
un nc la 20 phut.Coi rang nhiet lng cung cap e un soi nc la co ch, tnh hieu
suat cua bep.
c). Mot ngay s dung bep ien nay 5 gi. Tnh tien ien phai tra cho viec s dung
bep trong 30 ngay, neu gia 1 kW.h la 750 ong.
2, Cho hai in trR1 = 15 v R2 = 10 c mc song song vi nhau vo mch in c hiu in th 18V. a- Tnh in tr tng ng ca oan mch? b- Tnh cng dng in chy qua mi in tr? c- Mc ni tip vi R2 thm mt in tr R3 = 5 . V s mch in v tnh cng dng in qua mch chnh lc ny?