Skip to main content
Super TutorResources
Chapter 23 of 32
Study Plan

Alternating Current — Study Plan

ICSE · Class 12 · Physics

A step-by-step study plan for Alternating Current, ICSE Class 12 Physics: what to learn first, what to practise and when to revise.

70 questions37 flashcards23 formulas & key relations5 concepts

Interactive on Super Tutor

Studying Alternating Current? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for study plan and more.

Try Super Tutor — Free

Free trial, no card needed.

A graph showing the linear relationship between inductive reactance (X_L) and frequency (f or ω), demonstrating that X_L increases proportionally with frequency.
Super Tutor

One of 5 illustrations for Alternating Current in Super Tutor — alongside flashcards, concept maps and practice questions.

Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: 1. Basic idea of alternating current, 2. Peak value, mean value, and rms value, 3. AC from a rotating coil and AC generator.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 70 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Alternating Current after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • AC changes periodically in magnitude and direction.
  • DC is constant in magnitude and direction.
  • Peak emf of a rotating coil is V0 = NBAω.
  • Mean value over full cycle is zero.
  • Mean value over half cycle is 0.637 I0.
  • RMS value of sinusoidal AC is 0.707 I0.
  • Phasors represent AC quantities as rotating vectors.
  • Phase difference is the angle between voltage and current phasors.
  • In a resistor, current is in phase with voltage.

Common Mistakes to Avoid

The mean value of alternating current is always the same as its rms value.

In a pure inductor, current leads voltage by 90°; in a pure capacitor, current lags voltage by 90°.

Inductive reactance decreases when frequency increases, and capacitive reactance increases when frequency increases.

Memory Tips

Direct current and alternating current

Instantaneous alternating current and voltage

Peak value of emf induced in a rotating coil

Periodic time and frequency

Want a personalised study plan?

Super Tutor builds a day-by-day plan for ICSE Class 12 Physics that fits your exam date and pace.

Create My Study Plan

Frequently Asked Questions

What are the important topics in Alternating Current for ICSE Class 12 Physics?
Key topics in Alternating Current include Basic idea of alternating current, Peak value, mean value, and rms value, AC from a rotating coil and AC generator, Reactance and impedance. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Alternating Current for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 70 practice questions on Alternating Current. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Alternating Current

All ICSE Class 12 Physics Study Plan

For serious students

Get the full Alternating Current chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 12 Physics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free