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t = 5 min = 5/60 = 0,08 h
P = W / t /* t
W = P * t
W = 2,2 kW * 0,8 h = 1,76 kWh
W = E = pobrana energia eletryczna
zakładam , że 1 kWh kosztuje 60 gr = 0,6 zł
koszt :
1,76 * 0,6 zł = 1,056 zł ≈ 1,06 zł