A = I^2 * R * t (закон Джоуля-Ленца)
R = U / I
A = I * U * t
A = 50 * 12 * 2 = 1200 Дж
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A = I^2 * R * t (закон Джоуля-Ленца)
R = U / I
A = I * U * t
A = 50 * 12 * 2 = 1200 Дж