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Difficulty: EasyConductors, Insulators, and Semiconductors

Standard electrical cables typically consist of an inner copper wire surrounded by a flexible rubber or plastic jacket. What is the primary electrical purpose of this outer jacket?

  1. A
    To act as a secondary conductor that increases total current capacity
  2. B
    To function as a semiconductor that regulates voltage fluctuations
  3. To serve as an insulator that prevents electric current from escaping the wireAnswer
  4. D
    To reverse the direction of electron flow along the surface of the copper core

Answer

To serve as an insulator that prevents electric current from escaping the wire
The rubber or plastic jacket is an electrical insulator. Because insulators have extremely high resistance and tightly bound valence electrons, they block the flow of electric current. This ensures that electrical current remains confined within the copper conductor, preventing accidental contact, short circuits, and electrical shock.

Step-by-Step Solution

1
Identify the electrical classification of the outer jacket material (rubber or plastic).
Rubber and plastic are non-metallic materials classified as electrical insulators.
Insulators have tightly bound valence electrons and extremely high resistance to electrical current.
2
Determine the functional role of an insulator surrounding a metallic conductor.
The insulator confines the flow of electric charges inside the copper conductor.
Preventing current leakage protects people from electric shock and prevents dangerous short circuits.

Key Concept

Insulators have high electrical resistance and tightly bound valence electrons, preventing current from leaking out of conductors.
Estimated Time:45s
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Topics

Conductors, Insulators, and Semiconductors

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