Rozwiązał by mi to ktoś mądry :D z Góry dziękuję

zad. 5. P = 2 kW = 2000 W = 2000 J/s t = 2 h = 2 *3600 s = 7200 s  W = ? P = W / t W = P * t W = 2 kW * 2 h = 4 kWh W = 2000 J/s * 7200 s = 14400000 J zad.6 I = 0,10 A t = 10 min = 10 *60 s = 600 s q = ? I = q/ t q = I * t q = 0,10 A * 600 s =  60 C zad.7 V = 50 l    dla wody 1 l = 1 kg m = 50 kg T₁ = 15 C T₂ = 35 C ΔT = 35 C - 15 C = 20 C t = 30 min = 30 *60 s = 1800 s cw = 4200 J/kg * C P = ? W = Q [latex]P * t = m * c_w * Delta T / : t [/latex] [latex]P = frac{m * c_w * Delta T}{t} [/latex] [latex]P = frac{50 kg * 4200 frac{J}{kg * C }* 20 C }{1800 s } = frac{4200000 J }{1800 s } = 2333,3 W = 2,3 kW[/latex]