Alternating current | NCERT Physics Class 12 | Science | Khan Academy
This resource offers a unit on Alternating Current for Class 12 Physics students in India, aligned with NCERT curriculum. It is part of Khan Academy's mission to provide free, world-class education and appears to be accessible via a web browser.
Overview
Added
March 18, 2026
Subject & domain
physics · ac-circuits-electromagnetic-waves
Grade range
Grade 11 (Junior)–Grade 12 (Senior)
Page kind
Course
Introduction
Key Topics in Alternating Current (NCERT Physics Class 12)
- Phase Relationships: Analysis of leading and lagging voltage and current using trigonometric identities and graphical representations (qualitative and quantitative).
- Circuit Elements: Study of current and potential curves, and the effect of frequency and component values (L/C) on current in purely inductive and capacitive circuits.
- Phasor Diagrams:
- Conceptual understanding of phasors.
- Relating phasors to trigonometric equations and graphs.
- Applications for pure circuits.
- LCR Series Circuits:
- Analysis of current and voltage relationships.
- Calculation of phase angles.
- Resonance frequency and frequency response graphs.
- Transformers: Principles and operation within AC systems.
- Assessments: Includes two quizzes and a comprehensive unit test.
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