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Alternating Current — Important Topics

MHT-CET · Physics

Most important topics from Alternating Current for MHT-CET Physics 2026 — high-weightage areas based on previous year analysis.

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A comparison of Alternating Current (AC) and Direct Current (DC) waveforms, showing AC as a sinusoidal wave changing direction and magnitude, and DC as a constant, unidirectional line.
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Alternating Current — Syllabus & Topics

Topics covered in Alternating Current for MHT-CET Physics.

Topics in Alternating Current

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

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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