Kirchhoff's Voltage Law
In a closed loop of a circuit, if the sum of EMFs is 24 V and the sum of potential drops across resistors is 20 V, what is missing?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- kirchhoff's voltage law
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
4 V drop somewhere
- Kirchhoff's Second Law (Loop Rule): The sum of all electromotive forces (EMFs) around any closed loop must equal the sum of all IR potential drops.
- Based on Conservation of Energy.
- Check the Balance: ∑E=∑IR.
- Evaluation: 24 V(EMF)=20 V(Dropssofar)+X.
- Inference: There is a discrepancy of 4 V. This implies there is an additional potential drop of 4 V that has not been accounted for (e.g., across an internal resistance or a forgotten component).
This medium difficulty physics question is from the chapter current electricity, covering the topic of kirchhoff's voltage law. It appeared in the 2025 exam.
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