ex 4 va rog mult
dau coroana
![Ex 4 Va Rog Multdau Coroana class=](https://ro-static.z-dn.net/files/d98/f1d93cdec00758b880724cff2136be22.jpg)
Răspuns:
P = W/t0
12 * 60w = W/240s
W =720 * 240 J
1 kwh = 1000w * 3600s = 3 600 000J
W = 720 * 240/ 3 600 000 = 0.048 kwh
Explicație: