Physics Current Electricity DUHS 2023
PMDC Verified Question 44 of 112
The internal resistance of a battery is:
A
In parallel to the external load
B
In series to the external load
C
Not connected to the external load
D
Zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: In series to the external load
Concept:

In circuit models, a real battery is modeled as an ideal voltage source (EMF) paired with a resistor.

Solution:

  • Because 100% of the current leaving the battery MUST first fight through the battery's own internal electrolytes, this resistance physically lies in the exact path of the load.


  • Therefore, it acts completely in series with the external load.


Why other options are incorrect:

  • Opt A: If it were parallel, current could completely bypass it.


  • Opt D: Only ideal theoretical batteries have zero internal resistance.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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