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60W*4*5h*30=36000Wh=36kWh
36kWh*0,5zł=18zł
5W*4*5h*30=3000Wh=3kWh
3kWh*0,5zł=1,5zł
18zł-1,5zł=16,5zł
Odp. D
2.
4,6kWh/2h=2,3Kw
Odp. C
P=UI ---> I=P/U
I=2300W/230V=10A
Odp. D