Question

Puterea unui motor este egala cu 1 W. Afla lucrul mecanic efectuat de acesta timp de 1 h.

Answer 1

P=1 W
t=1 h=3600 s
L=P·t
L=1 W·3600 s
L=3600 J=3,6 kJ.

Answer 2

!W=J/s
P= L/Δt⇒1W=L/1h⇒1W=L/3600 s⇒L=3600s·W=3600s·J/s⇒L=3600 J=3,6kJ