1、 2014-2015 36 3 1 A A B C D A B C D 2 C A S1 B , C D S1 S2 S1 S2 A S1 S1 A B C C B D S1 S2 D 3 A 220V 220V A B B C C D D A 220V 4 D A B 380V C D 1 2 3 A D B 220V C C B D A 5 B A B C D P=I2R A P=I2R B I= C D 6 D A B C 0 D 1 2 3 4 10 A B 10 C 0 D . 7 A 0.5N B B A 0.5N B 1N C 2N D 4N 1cm F1l1=F2l2 F cm
2、=2N cm F1=1N 8 A B A A B C D A B 9 D A 100% B C D 100% A 100% B C D 1 10 C A B C D 1 2 3 4 A A B B C C D D 11 S A V R1 R2 R R R1 R2 C A R1 B R2 C R1 D R2 R R R1 R2 R=R2 R2 R1 12 P R2 P B A B C D 1 2 A A B B C C D D 64 13 16 4 17 19 3 25 13. 1 1 2 2 14 18 2A V 1min J 1min I= U=IR=2A =36V 1min Q=I2Rt=
3、 2A s=4320J 36 4320 15 1 2 1 2 1 2 1 2 16. 1 2 OB O F B AB F OA AB AC OB F OA F AC OB OB OA OA 17 30min 50 J W 1kW h 2500r 50r w P t 50r W= 1 2500 kW h kW h 4 J 0.02 0.5 w kw h P th =0.04kW=40W 4 40 18 6V R0 5 R 1A Rt 0.3A 0 100 100 0 A . 100 R R0 0 100 R R = R =R R R0=20 10 5 =5 0 R R =R R0+R =50 +5 +5 =
