chu de on thi HSG cuc hay .6434

chu de on thi HSG cuc hay .6434 - r r r r 4 3 2 1 = Phn in...

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Unformatted text preview: r r r r 4 3 2 1 = Phn in hc A/. Tm tt kin thc 1/. Mun duy tr mt dng in lu di trong mt vt dn cn duy tr mt in trng trong vt dn . Mun vy ch cn ni 2 u vt dn vi 2 cc ca ngun in thnh mch kn. Cng gn cc dng ca ngun in th cng cao . Quy c in th ti cc dng ca ngun in , in th l ln nht , in th ti cc m ca ngun in bng 0. Quy c chiu dng in l chiu chuyn di c hng ca cc ht mang in tch dng, Theo quy c bn ngoi ngun in dng in c chiu i t cc dng, qua vt dn n cc m ca ngun in (chiu i t ni c in th cao n ni c din th thp). chnh lch v in th gia 2 im gi l hiu in th gia 2 im : V A-V B = U AB . Mun duy tr mt dng in lu di trong mt vt dn cn duy tr mt HT gia 2 u vt dn ( U=0 I =0) 2/. Mch in: a. on mch in mc song song : *c im: mch in b phn nhnh , cc nhnh c chung im u v im cui . Cc nhnh hot ng c lp. *Th cht: 1. Uchung 2. cng dng in trong mch chnh bng trng cng dng in trong cc mch r I=I 1 +I 2 +...+I n 3.Nghch o ca in tr tng ng bng tng cc nghch o ca cc in tr thnh phn R=R 1 +R 2 +...+R n-T t/c 1 v cng thc ca nh lut m .I 1 R 1 =I 2 R 2 =....=I n R n =IR- t t/c 3 on mch gm n in tr c gi tr bng nhau v bng r th in tr ca on mch mc song song l R=r/n.- t t/3 in tr tng ng ca on mch mc song song lun nh hn mi in tr thnh phn . b. on mch in mc ni tip: *c im:cc b phn (cc in tr) mc thnh dy lin tc gia 2 cc ca ngun in ( cc b phn hot ng ph thuc nhau ). *tnh cht: 1.I chung 2. U=U 1 +U 2 +....+U n . 3. R=R 1 +R 2 +,...R n . *T t/c 1 v cng thc ca nh lut m I=U/R U 1 /R 1 =U 2 /R 2 =...U n /R n . ( trong on mch ni tip, hiu in th gia 2 u cc vt dn t l thun vi in tr ca chng) U i =U R i /R... T t/s 3 nu c n in tr ging nhau mc ni tip th in tr ca on mch l R =nr. Cng t tnh cht 3 in tr tng ng ca on mch mc ni tip lun ln hn mi in tr thnh phn . C.Mch cu : Mch cu cn bng c cc tnh cht sau: 1 I I I I r r I I r r I I 4 2 3 1 3 4 4 3 1 2 2 1 ; ; ; = = = = ; 4 3 2 1 r r r r - v in tr: . ( R 5 l ng cho ca cu)-V dng: I 5 =0 -v HT : U 5 =0 suy ra Mch cu khng cn bng : I 5 khc 0; U 5 khc 0 * Trng hp mch cu c 1 s in tr c gi tr bng 0 ; gii bi ton...
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chu de on thi HSG cuc hay .6434 - r r r r 4 3 2 1 = Phn in...

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