Physics, 18.03.2021 02:50 mitetwojr

PLS HELP URGENT DAU COROANA INIMIOARA 5 STELE PL HE electric a cărui schemă este ilustrată în figura alăturată conţine o baterie cu t. e.m. E = 120 V şi rezistenţa internă r = 4Ω şi
patru rezistoare având rezistenţele electrice R1 = 6 Ω , R2 = 2Ω ,
R3 = 4Ω şi R4 = 3Ω . Neglijând rezistenţa electrică a firelor
conductoare din circuit, determinaţi:
a. rezistenţa electrică a rezistorului echivalent cu ansamblul
rezistoarelor R1 , R2 , R3 ;
b. intensitatea curentului electric din ramura ce conţine bateria;
c. căderea de tensiune Uab pe rezistorul cu rezistenţa electrică R2 ;
d. valoarea pe care ar trebui să o aibă rezistenţa rezistorului R4 (toate celelalte elemente de circuit rămânând neschimbate) pentru ca bateria să debiteze în circuitul exterior un curent electric cu intensitatea I4 = 10 A .

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PLS HELP URGENT DAU COROANA INIMIOARA 5 STELE PL HE electric a cărui schemă este ilustrată în figur...