Building Codes Usually Limit the Current Carried by a No

question 12

Multiple Choice

Building codes usually limit the current carried by a No.14 copper wire to 15 A.Many household circuits are wired with this size wire.What is the drift velocity of the electrons in this case? The diameter of this wire is 1.6 mm.Assume one conduction electron per atom in copper.The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m³.Avogadro's number is 6.022 × 10²³ molecules/mol and e = 1.60 × 10^-19 C.

• A)5.51 × 10^-4 m/s
• B)4.56 × 10^-4 m/s
• C)1.65 × 10^-3 m/s
• D)4.44 × 10^-2 m/s
• E)4.89 × 10^-5 m/s

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Definitions:

Market Price

The current value at which an asset or service can be bought or sold in the open market.

Quantity Demanded

The total amount of a good or service that consumers are willing and able to purchase at a specific price, at a given time.

Quantity Supplied

The amount of a good that producers are willing and able to sell at a given price over a specified period of time.

Surplus

A surplus of goods or services available compared to the demand, typically resulting in lower prices.