Odpowiedź :
Odpowiedź:
t = 5 min = 5*60s = 300 s
W = 24 kJ = 24 000 J
I = 400 mA = 0,4 A
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R, U ?
Q = I*t = 0,4A * 300 s = 120 C
W = Q*U
U = W/Q = 24000J/120C = 200 V
U = 200 V
R = U/I = 200V/0,4A = 500 Ω
R = 500 Ω