Chapter 14 of 28
Revision Notes
Alternating Current — Revision Notes
MHT-CET · Physics
Free Alternating Current revision notes for MHT-CET Physics 2026 — key concepts, formulas, and definitions for quick revision.
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Key concepts, formulas, and definitions from Alternating Current for MHT-CET Physics preparation.
Key Topics to Revise
1
Fundamentals of Alternating Current
- AC current magnitude changes continuously with time and direction reverses periodically
- AC is preferred over DC because it can be easily converted using transformers
- Current and voltage can be represented as sine or cosine functions
2
AC Voltage Applied to Pure Components
- Pure Resistor: Current and voltage are in phase (φ = 0°)
- Pure Inductor: Current lags voltage by 90° (φ = -90°)
- Pure Capacitor: Current leads voltage by 90° (φ = +90°)
3
Series LCR Circuit and Impedance
- Total opposition to AC current is called impedance (Z)
- Impedance combines resistance and net reactance vectorially
- Phase angle depends on relative values of X_L and X_C
4
Resonance in AC Circuits
- Resonance occurs when X_L = X_C in LCR circuit
- At resonance, impedance is minimum and equals resistance R
- Current is maximum at resonant frequency
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Key Concepts
AC voltage/current varies as V =In a purely resistive circuitIn a purely inductive circuitIn a purely capacitive circuitIn series LCR circuits
Frequently Asked Questions
What topics are covered in Alternating Current for MHT-CET?
Alternating Current is an important chapter in MHT-CET Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Fundamentals of Alternating Current, AC Voltage Applied to Pure Components, Series LCR Circuit and Impedance, Resonance in AC Circuits.
How important is Alternating Current for MHT-CET?
Alternating Current is a frequently tested chapter in MHT-CET Physics. Questions from this chapter appear regularly in previous year papers. There are 242 practice questions available for this chapter.
How to prepare Alternating Current for MHT-CET?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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