Oblicz energie w J i kWh wykonana przez urzadzenie o mocy 2kW w czasie 20 minut (E=W=P*t)
E= 2kW*1200s= 2400J=24kW
W = praca prądu (energia) = ?
P = Moc = 2 kW
t = czas = 20 min = 1/3 h
W=P*t
W = 2kW * 1/3 h
W = 2/3 kWh
1 kWh = 1000 W * 3600 s = 3600000 J
1 kWh - 3600000 J
2/3 kWh - X
x= 2/3 * 3600000 = 2400000 J = 2400 kJ
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E= 2kW*1200s= 2400J=24kW
W = praca prądu (energia) = ?
P = Moc = 2 kW
t = czas = 20 min = 1/3 h
W=P*t
W = 2kW * 1/3 h
W = 2/3 kWh
1 kWh = 1000 W * 3600 s = 3600000 J
1 kWh - 3600000 J
2/3 kWh - X
x= 2/3 * 3600000 = 2400000 J = 2400 kJ