Jaki prąd pobiera silnik o mocy P=2 kW na napięcie 230V i współczynnik mocy cos fi = 0,5 ?
Jaki prąd pobiera grzejnik o takiej samej mocy ?
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P = 2 kW = 2 000 W
U = 230 V
cos fi = 0,5
Silnik:
P = U*I*cos fi
zatem
I = P/U*cos fi
I = 2000 W/230 V *0,5 = 2000 W/115 V = 17,4 A
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Grzejnik:
P = U*I
I = P/U = 2 000 W/ 230 V = 8,7 A
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