tailieunhanh - Physics exercises_solution: Chapter 26

Bộ tài liệu bài tập tham khảo môn vật lý bậc đại học bằng tiếng anh Chapter 26 | x n 1 1 a R I eq V 32 20 . T V 240 V b I ----- ---------- Req Q eq c 132Q V Î40V A Aoq V 2401 32Q R 32 Q 20Q R 20 Q Q. A. 12 A. D 1 1 T1 R1 R2 RR Rea -----1---I -----------I R -------------. eq D Pl D D eq D i D V R1 R2 V R1R2 R1 R2 Rea R1 R1 and R R2 R1 R2. eq 1 R1 R2 1 eq 2 R1 R2 2 For resistors in series the currents are the same and the voltages add. a true. b false. c P 12R. i same R different so P different false. d true. e V IR. I same R different false. f Potential drops as move through each resistor in the direction of the current false. g Potential drops as move through each resistor in the direction of the current so Vb Vc false. h true. a False current divides at junction a. b True by charge conservation. c True. V V2 so I œ 1 2 R d False. P IVV1 V2 but I1 I2 so P1 P2. e False. P IV . Since R2 R1 P2 P. f True. Potential is independent of path. g True. Charges lose potential energy as heat in R1. h False. See answer to g . i False. They are at the same potential. a R i- - Q. eq Q Q Qj b I2A e 28 V Q A I16 e R16 28 V Q A 28 V Q . c Itotal e Rtotal 28 V Q 35 A. d When in parallel all resistors have the same potential difference over them so here all have V 28 V. e P2A A 2 Q 327 W P16 12R16 A 2 Q 490 W 11 A 2 Q 163 W. f For resistors in parallel the most power is dissipated through the resistor with the n . V2 . Tr least resistance since P I R with V constant. R a Req E R Q Q Q Q. . . . . . 28 V . . _ . b The current in each resistor is the same and is I --- -------- A. R Q eq c The current through the battery equals the current of b A. d A Q V V16 A Q Q V. e n -t2r 3 18A 2 2 4 Q - 24 3 W P -T2R - 3 18 A 2 16 O - e 24 2 4 .40 . . 1 6 1 6 2 .AO . W A 2 Q W. f For resistors .