The – data for a wire are as follows: At : and

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Problem

The

I

–

V

data for a wire are as follows: At

20^{\circ}\text{C}

:

(0.50\,\text{A}, 1.8\,\text{V})

and

(2.0\,\text{A}, 7.2\,\text{V})

. At

80^{\circ}\text{C}

:

(0.50\,\text{A}, 2.6\,\text{V})

and

(2.0\,\text{A}, 10.4\,\text{V})

. Assuming the wire obeys Ohm’s law at each temperature, what is the percentage increase in its resistance when the temperature rises from

20^{\circ}\text{C}

to

80^{\circ}\text{C}

? (a)

31\,\%

(b)

44\,\%

(c)

22\,\%

(d)

36\,\%

Related theory

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