Chapter 21, Problem 8PCE

Predict/Explain Current-versus-voltage plots for two materials, A and B, are shown in Figure 21-37. (a) Is the resistance of material A greater than, less than, or equal to the resistance of material B at the voltage V₁? (b) Choose the best explanation from among the following:

1. I.                    Curve B is higher in value than curve A.
2. II.                  A larger slope means a larger value of I/V, and hence a smaller value of R.
3. III.               Curve B has the larger slope at the voltage V₁ and hence the larger resistance.