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1800 -n
60 -t
Wzór n/t=Hz
1800/60=30Hz
T=60[s]/1800[obr.]=1/30[s];
f=1/T;[1/s]=[Hz];
f=1/(1/30);
Odp.Częstotliwość wynosi f=30[Hz].
n=1800 razy
t=1 min=60s
szukane:
f=?
f= n/t
f=1800/60s
f=30 [1/s]
f=30Hz
odp:częstotliwość prądu wynosi 30Hz.