Kirchhoff's Voltage Law

Question

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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1. **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**.
2. **Check the Balance**: $\sum E = \sum IR$.
3. **Evaluation**: $24 	ext{ V} (EMF) = 20 	ext{ V} (Drops so far) + X$.
4. **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).

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