Physics Current Electricity KU 2024
PMDC Verified Question 8 of 112
Temperature coefficient of resistance is defined as increase as increase in resistance per ohm original resistance per ____.
A
Degree rise in temperature
B
Unit increase in electric current
C
Unit decrease in capacitance
D
Degree drop in temperature
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Degree rise in temperature
Concept:

The mathematical definition of the temperature coefficient gives context to physical properties.

Formula:

$$ \alpha = \frac{\Delta R}{R_0 \cdot \Delta T} $$

Solution:

  • Reading the formula in words: It is the fractional change in resistance (\(\Delta R / R_0\)) per unit change in temperature (\(\Delta T\)).


  • Therefore, it is measured per Degree rise in temperature.


Why other options are incorrect:

  • Opt B & C: Fundamentally unrelated to thermal properties.


  • Opt D: Standard definition uses "degree rise" to align with standard positive definitions of \(\alpha\).

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