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t = 24 h = 24 * 3600s = 86 400 s
R = 50 om
I = 200 mA = 0,2 A
szukane:
W = ?
W = U * I * t
ale U = I * R
W = I^2 * R * t
W = 0,2^2 * 50 * 86400
W = 172 800 J = 172,8 kJ
1 kJ = 1000 J