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(15) p=u2/R ES=1,5 +1,5+1,5+1,5 P=62/3 ES=6V P=12W (16) U=R . i 220=10. I i=220/10 i=22A (17) 12/R2=(300/150).(0,6/0,3)2 12/R2= (2).(2)2 12/R2=8 R2=1,5ohm (18) p=5,51.10-6ohm m A=0,12.10-6m2 R=PL/A 40=5,51.10-6L/0,12.10-6 5,51L=4,8 L=4,8/5,51 L=0,87m ou L=87cm (19) V2=V.R2/R1+R2 V2=10.4700/1000+4700 V2=10.0,82 V2=8,2V (21) Req=4700.560/4700+560 Req=2.632.000/5260 Req=500,38ohm I1=Req.is/R1 I1=500,38.0,24/4700 I1=0,025ª I2=500,38.0,24/560 I2=0,21A (22) 1/Req=1/60+1/40+1/20+1/10 V=R.i 1/Req=0,1916 V=5,2.11,5 Req=1/0,1916 V=60v Req=5,2ohm V=R1.I1 60=60.I1 I1=60/60 I1=1A I2=V/R2 I3=60/20 I4=60/10 I2=60/40 I3=3A I4=6A I2=1,5A
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