Zadanie.1
Wzór: W = U·I·t
W = 230V * 10A * 3600s = 8 280 000 J
1 kJ = 1000 J
1 MJ = 1 000 000 J
W = 8,28 MJ
Zadanie.2
Wzór:W = U*I*t /:Ut I = W/Ut
Odp: I = 103500J/(230V*1800s)
I = 0,25 A
Zadanie.3
Wzór: W = U*I*t /:It U = W/It
Odp: U = 1350J/(0,5A*600s)
U = 4,5 V