alleryStart learning →Two batteries of $10\,\text{V}$ and $5\,\text{V}$ are connected in series-aiding (same polarity). The combined voltage is
A$5\,\text{V}$
B$15\,\text{V}$
C$50\,\text{V}$
D$7.5\,\text{V}$
Answer & Solution
Correct answer: B. $15\,\text{V}$
1. SERIES-AIDING batteries: voltages ADD because their EMFs are in the same direction around the loop.
2. $V_{total} = 10 + 5 = 15\,\text{V}$.
3. If connected SERIES-OPPOSING: voltages subtract → $|10 - 5| = 5\,\text{V}$ (option A's case).
4. Option C multiplies. Option D averages.
_Source: Tony Kuphaldt, "Lessons in Electric Circuits — DC", Vol I, Ch 5 (Series sources)._
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