Răspuns :
In sistemul international, caldura degajata (energia electrica) se masoara in Joule !
Demonstratie:
W=(U^2/R)*t=I^2*R*T=U*I*t=P*t
unde P = Puterea mecanica.
Puterea mecanica se masoara in Watt = Joule/secunda =>
W=P*t = W*s = J/s*s = J/1 = J = Joule