AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: bbda1042
In which of the following materials or media is Ohm's law not applicable?
In which of the following materials or media is Ohm's law not applicable?
Multiple Choice Options
- A
Electrolytes
- B
Arc lamps
- C✓ Correct Option
Insulator
- D
vacuum tube devices
Detailed Technical Solution & Explanation
Ohm's Law () applies strictly to ohmic conductors where current is linearly proportional to voltage at constant physical temperature. Insulators have virtually zero free carriers and do not obey linear conduction; under extreme electric fields, they undergo non-linear dielectric breakdown.
Option Analysis:
•
Option A (Electrolytes): Incorrect. Weak/strong electrolytes conduct ions and follow Ohm's law at low voltages.
•
Option B (Arc lamps): Incorrect. Arc lamps exhibit non-linear negative differential resistance, but among materials listed, insulators represent non-conducting media.
•
Option C (Insulator): Correct. Insulators do not maintain a linear constant-resistance conduction relationship.
•
Option D (vacuum tube devices): Incorrect.
Reference: Mock Test 07NEC Licensure Syllabus