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P=600W
Wu=360kJ=360000J
(40/100)*P*t=W
Szukane:
t=?
Obliczenia:
(40/100)*P*t=W |*(100/40P)
t=10W/4P
t=(10*360000J)/(4*600W)=3600000J/2400W=1500s
Odpowiedź. Silnik ten wykona pracę 360kJ w czasie 150s.
mam nadzieje ze pomoglem :)
η=40%
P=600W
t=?
η=Wu*100%/W
W=Wu*100%/η=360kJ*100%/40%=900kJ=900kWs
W=U*I*t=P*t
t=W/P=900000Ws/600W=1500s=25min