Grades/ Grade 12/ Physics/Unit 6 · Alternating Current

Class XII · Physics · Chapter 6

Alternating Current — three ways to learn it.

Watch a voltage rise and fall fifty times a second, see how coils and capacitors resist it, and tune an RLC circuit until it sings at resonance. Pick any door — they all teach the same chapter.

Choose how you want to learn

Lecture & walkthrough

The complete written lesson — alternating quantities and the peak / rms values (I_rms = I₀/√2), inductive and capacitive reactance (X_L = ωL, X_C = 1/ωC), impedance in an RLC series circuit, the resonance condition (X_L = X_C) and power in AC circuits (P = V_rms I_rms cosφ).

8 sections · ~25 min read

Open the lecture →

Interactive lecture

As you scroll, a live 3D panel animates every idea: trace the AC sine wave on an oscilloscope, then sweep the frequency through an RLC circuit and watch the current peak sharply at resonance — alternating current, alive on screen.

Same content · live 3D animation per section

Open the interactive lecture →

Run the reactance-versus-frequency experiment on a safe, virtual bench: sweep the supply frequency and measure how the reactance of a coil and a capacitor change, plotting X_L and X_C against frequency.

Hands-on · 3D apparatus + live reactance chart

Enter the virtual lab →

Test yourself

📝 Practice — board MCQs & solved numericals ← Back to all chapters

One chapter, three doors

Read it, sweep the frequency to resonance in 3D, then check yourself.