Physics Current Electricity MDCAT 2009
PMDC Verified Question 108 of 112
The fractional change in resistance per Kelvin is known as:
A
Temperature coefficient of resistance
B
Linear coefficient of expansion
C
Thermal coefficient
D
Volumetric coefficient of expansion
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Temperature coefficient of resistance
Concept:

The fractional change in resistance \( \left(\frac{\Delta R}{R_0}\right) \) per unit change in temperature \( (\Delta T) \) is the formal definition of a specific electrical property.

Formula:

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

Solution:

  • By definition, this quantity \( \alpha \) is called the Temperature coefficient of resistance.


Why other options are incorrect:

  • Opt B & D: These refer to physical dimensional changes (length and volume) due to heat, not electrical resistance.


  • Opt C: A vague term that does not specifically denote resistance change.

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