8. CE Predict/Explain Current- versus-voltage plots for two materials, A and B,

Question

8. CE Predict/Explain Current- versus-voltage plots for two materials, A and B, are shown in Figure 21-37. (a) Is the resis- tance of material A greater than, l resistance of material B at the Voltage FIGURE 21-37 Problems 7 and 8 ess than, or equal to the voltage V,? (b) Choose the best explanation from among the following: I. Curve B is higher in value than curve A. II. A larger slope means a larger value of I/V, and hence a smaller value of R. III. Curve B has the larger slope at the voltage V, and hence the larger resistance.

Explanation / Answer

a )

from the given graph

current at V1 for resistor A is lower of B

According to Ohm's Law I = V/R

so using above equation

A material's resistance is greater than the material B resistance

b )

Second explanation is correct that

a larger slope means a larger value of I/V, and hence smaller value of R

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