Jadeen Says That You Can Increase the Resistance of a Copper

question 9

Multiple Choice

Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer. Arnell says that you can increase its resistance by heating the wire. Which one, if either, is correct, and why?

• A) Arnell, because the conductivity of the wire increases when it is heated.
• B) Arnell, because the conductivity of the wire decreases when it is heated.
• C) Jadeen, because the conductivity of a wire is directly proportional to its area and inversely proportional to its length.
• D) Jadeen, because the conductivity of a copper wire does not increase when it is hammered.
• E) Both are correct because (b) and (d) are both correct.

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Definitions:

Break-even

The point at which total costs and total revenues are equal, resulting in no net loss or gain.

Unit Variable Costs

The costs that vary directly with the level of production or output.

Revenue

The total amount of money received by a company for goods sold or services provided during a certain time period.

Break-even Analysis

A calculation to determine the point at which revenue received equals the costs associated with receiving the revenue, indicating no net loss or gain.