Primele 2 probleme, va rog.

1)
1 kWh=3,6*10⁶ J
3,5 kWh=12,6*10⁶ J
d
2)
P=U²/R=>R=U²/P
UΔt/R=UΔtP/U²=ΔtP/U=W/U
[W/U]=J/V
c