Odpowiedzi

2010-01-20T14:44:47+01:00
2,1kW=2100W
12min=720s
P=W/t
P=W/t /*t
P*t=W
W=2100W*720s
W=1512000W*s
W=1512000J
W=1512KJ
2010-01-20T14:46:25+01:00
P=2,1kW=2100W
t=12min=720s
W=U*I*t ale U*I=P stąd W=P*t
W=2100W*720s=1512000Ws=1512000J=1512kJ=1,512MJ