bec=100W/h Masina de spalat =1800W/h radiator cu ulei cu 8 elementi=2000 W/h=2kw/k Instant apa (incalzitor apa)=6000 W/h=6kw/h monitor calculator =120w/h enegie consumata 100+1800+2000+6000+120=10020w/h=10,02kw/h 10,02x20=200,4 kw in 20 ore daca ar functiona permanent 200,4x0,4=80,16 lei