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5、6 4400 960 18. 3 0.5 8 1:3 6 44 19. 4 20. 9 1 G=mg=50kg 10N/kg=500N 2 2 n=2 1min s=2h=2 12m=24m W=Fs=200N 24m=4800J 2 P= = =80W 1 3 =50% G=400N = = = = 50%= G =400N 2 =60% = 60%= G =600N 2 21. 8 1 P= R= = =1210 2 2 6h W=Pt=0.040kW 6h=0.24kW h 2 3 P=UI I= = =0.1A 1 R 2 = = =100 1 R = = =2200 1 R R=R R 2 =2200 100 =2100 1 22. 5 1 2 3 2.1 10 323. 9 1 2 2 B 2 3 2 1 4 R 2 “10 2A ” 1 R 2 1V 5V 1 24. 9 1 2 80 3 6 4 14.4 5 700 7.98 2