Odpowiedzi

2010-03-21T10:36:58+01:00
I1=5A
U1=220V
I2=11A
U2=9,5V
η=?
-----------------------------------------------
P1=U1*I1=220V*5A=1100W
P2=U2*I2=9,5V*11A=104,5W
η=P2*100%/P1=104,5W*100%/1100W=9,5%