day dan dong chat tiet dien deu co dien tro r= 256. phai cat day ra bao nhieu doan thang bang nhau de khi mac song song nhau thi dien tro tuong duong bang 4
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cho dien tro R1 lam bang chat lieu co p=0,4.10-6om.m chieu dai l=18,5m duong kinh tiet dien d=2mm
tinh gia tri dien tro R1
dien tro R1 nay mac song song voi dien tro R2=6om vao hieu dien the ko doi 36V. ting dien tro tuong duong cua mach va CĐDĐ qua moi dien tro
mot day dan dai 180 m duoc dung de dung quan thanh mot cuon day , khi dat vao hai dau day mot hieu dien the 36V thi dong dien chay qua day la 0,5 A
A, TINH DIEN TRO CUA DAY
b, neu dung 2 cuon day tren mac noi tiep voi nhau thi dien tro cua ca soi day la bao nhieu
c,mot doan day dai 5m cua soi day tren co dien tro la bao nhieu
1 ,Duong day tai dien tu huyen ve xa dai 10km co hieu dien the truyen di 1 dong dien 200 A day dan bang dong cu 1km co R =0,2 Ω Tinh cong suat hao phi do toa nhiet tren duong day ( biet moi duong day tai dien gom 2 day mac song song voi nhau )
mot doan mach gom 2 dien tro 300Ω va 600Ω mac song song, dien tro tuong duong cua doan mach bang
Điện trở tương đương của đoạn mạch là
\(R_{tđ}=\frac{R_1R_2}{R_1+R_2}=\frac{300.600}{300+600}=200\Omega\)
De trang tri cho quay hang nguoi ta dung n bong den loai ̉̉̉̉̉̉̉̉6v-12w mac thanh mot so day noi tiep roi mac song song voi nhau vao hieu dien the 220v nhan thay neu mac thanh 2 hay 3 day deu nhau thi chi can 1 dien tro phu r chung cho cac day la cac den sang binh thuong. Hoi so bong den la bao nhieu va gia tri dien tro r, mac theo cach nao thi loi hon? Mong moi nguoi giup mik
1 day dan bang nikelin co chieu dai 100m, tiet dien 0.5mm2 duoc mac vao nguon dien co hieu dien the 120V
1/ tinh dien tro cua day
2/ tinh cuong do dong dien qua day
cho hai dien tro R1 va R2 biet rang khi mac noi tiep thi dien tro tuong duong cua chung la 50 om con khi mac song song thi dien tro tuong duong cua chung la 12,5 om tinh dien tro R1 vaR2
khi mắc nối tiếp: \(R_t=R_1+R_2=50\Omega\)
Khi mắc song song: \(R_t=\dfrac{R_1.R_2}{R_1+R_2}=12,5\Omega\)
\(\Rightarrow R_1.R_2=12,5.50=625\Omega\)
\(\Rightarrow\left\{{}\begin{matrix}R_1=50-R_2\\\left(50-R_2\right).R_2=1800\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}R_1=50-R_2\\R_2^2-90R_2+1800=0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}R_1=90-R_2\\\left\{{}\begin{matrix}R_2=30\\R_2=60\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}\left\{{}\begin{matrix}R_1=60\\R_2=30\end{matrix}\right.\\\left\{{}\begin{matrix}R_1=30\\R_2=60\end{matrix}\right.\end{matrix}\right.\)
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cho mach dien gom 1 dien tro r0= 10 mac noi tiep voi 1 bien tro r, doan mach tren duoc mac vao nguon dien co suat dien dong khong doi . khi thay doi r thay co 2 gia tri cua r la r1= 8 va r2 = 12 thi cong suat tieu thu tren mạch ngoai la nhu nhau va bang p= 6,35. thunh suat dien dong cua nguon dien e
giup e vs mn
1 mach dien co dien tro ngoai bang 5 lan dien tro trong . khi xay ra hien tuong doan mach thi ti so giua hieu dien the mach ngoai va suat dien dong cua nguon bang
A 5 B 2 C 0 D vo cuc