Odpowiedzi

2010-02-20T14:59:26+01:00
W=P*t=500W*30s=15000J=15kJ
2010-02-20T15:00:04+01:00
P=0,5 kW=500 W
t=0,5min=30s

P=W/t => W=P*t
W=15000 J = 15 kJ
1 3 1