Odpowiedzi

2010-03-22T16:35:08+01:00
P=1,5kW=1500W
t=20s
W=?
-------------------------------
W=P*t=1500W*20s=30000J=30kJ
2010-03-22T16:36:12+01:00
T= 20s

P= 1,5kW= 1,5* 1000W= 1500W

W=Pt

W= 1500W*20s= 30000J