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U = 100 mV = 0,1 V bo 1 mV = 0,001 V
I = 15 A
t = 20 s
W = U * I * t
W = 0,1 V * 15 A * 20 s
W = 30 J
zad.2.
U = 150 V
I = 3 A
P = U * I
P = 150 V * 3 A
P = 450 W = 0,45 kW