Physics Current Electricity BUMHS 2022
PMDC Verified Question 65 of 112
Which of the following is Ohmic device?
A
Filament bulb
B
Transistor
C
Semi-conductor diode
D
Copper wire
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Copper wire
Concept:

An Ohmic device strictly obeys Ohm's Law (\(V \propto I\)), meaning its resistance remains constant over a wide range of voltages and currents, provided physical conditions (like temperature) are stable.

Solution:

  • Copper wire is a classic metallic conductor that behaves linearly (ohmic) under normal operating conditions.


Why other options are incorrect:

  • Opt A: A filament bulb heats up drastically as current flows, causing its resistance to increase (non-ohmic).


  • Opt B & C: Semiconductors, diodes, and transistors inherently possess non-linear I-V characteristics.

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