Power in AC Circuit — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Power in AC Circuit.

LCR Series Circuit Power Calculation with Varying Frequency

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NEET frequently tests the ability to calculate average power in LCR circuits. A common variation is to provide R, L, C, and voltage, but ask for power at a specific frequency, or to compare power at different frequencies (e.g., at resonance vs. off-resonance). This requires calculating reactances, impedance, and power factor for each frequency, demonstrating a comprehensive understanding of the topic. Students must be proficient in handling $omega$ and its impact on $X_L$ and $X_C$.

Conceptual Questions on Power Factor and its Significance

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Beyond numerical problems, NEET often includes conceptual questions to test fundamental understanding. Questions might ask about the implications of a low power factor, methods of power factor correction (e.g., adding capacitors), or the physical meaning of $cosphi$. These require a qualitative understanding of why power factor is important in practical AC systems and how it relates to energy efficiency and transmission losses.

Wattless Current and Energy Storage in Reactive Components

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The concept of wattless current is a unique aspect of AC power. Questions could ask to identify circuits where average power dissipation is zero (pure L or C), or to explain why ideal inductors and capacitors do not dissipate power over a full cycle. This tests the understanding that these components store and release energy rather than converting it to heat, distinguishing them from resistors.