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:

Social Psychology

The scientific study of how individuals think, influence, and relate to one another within a societal context.

Developmental Psychology

Developmental Psychology is the scientific study of how and why human beings change over the course of their life, from infancy through to old age, focusing on psychological processes and development.

Clinical Psychology

A branch of psychology focused on diagnosing and treating mental illness, emotional disturbance, and dysfunctional behavior.

Minimal Risk

A situation where the probability and magnitude of harm or discomfort anticipated in the research are not greater than those ordinarily encountered in daily life or during routine physical or psychological examinations.