1600 1500 1400 1300 -n 1200 -1100 -1000 -900
800 I
30
5 10 15 20 25
I
■a)U=180V, lw=0.65A, R=0 c) U=180V, lw=0.65A, R=0
-b) U=180V, lw=0.6A, R=0
-d) U*180V, lw=0.65A, R»0