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:

Central Nervous System

The part of the nervous system consisting of the brain and spinal cord, responsible for integrating sensory information and responding accordingly.

Spinal Cord

The central nerve column that runs down the back and transmits messages between the brain and the rest of the body.

Neurons

Specialized cells transmitting nerve impulses; the basic building blocks of the nervous system.

Nerve Cells

Specialized cells that transmit electrical signals throughout the body, forming the basis of the nervous system.