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P- 1300W
W - 26MJ = 26 000J
P=W/t
t = w/p
t = 26000J / 1300W
t = 20s
Odp. Prąd płynący przez żelazko o mocy 1300W wykona prace 26MJ w 20s
W=26MJ=26000J
P=1300W
t=26000J/1300W=20s
W=P*t
t=W/P=7222Wh/1300W=5,56h