P27_052.PDF

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52. Since values from the referred-to graph can only be crudely estimated, we do not present a graph here,

but rather indicate a few values. Since

V /i

then we see

∞

when

= 0 (which the graph

seems to show throughout the range

−∞

< V <

2 V) and

= 0. For voltages values larger than 2 V,

the resistance changes rapidly according to the ratio

V /i.

For instance,

≈

3.1/0.002 = 1550 Ω when

= 3.1 V, and

≈

3.8/0.006 = 633 Ω when

= 3.8 V