Odpowiedź:
R = 15 Ω
n = 15
U = 24 V
t = 15 min = 15*60s = 900 s
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Rz = n*R = 15*15Ω = 225 Ω
a)
I = U/Rz = 24V/225Ω = 8/75 A ≈ 0,107 A
b)
P = I² · R = 0,107² ·15 = 0,172 W
c)
W = P*t = U*I*t = 24V*0,107A*900s = 2311,2 J
Wyjaśnienie: