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Alternating Currents

Telangana Open School (TOSS) · Class 12 · Physics

Complete topic list for Alternating Currents in Telangana Open School (TOSS) Class 12 Physics. Key concepts, sub-topics, and what to focus on for board exams.

51 questions30 flashcards5 concepts

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4 Topics · Telangana Open School (TOSS) Class 12 Physics

Topics in Alternating Currents

1

Alternating Current and Voltage

  • AC voltage and current vary sinusoidally with time.
  • General equations: \( V = V_m \cos \omega t \) and \( I = I_m \cos \omega t \).
  • Peak values: \( V_m \) and \( I_m \) are maximum voltage and current.
2

AC in Resistive, Inductive, and Capacitive Circuits

  • In a pure resistor, voltage and current are in phase (phase difference = 0).
  • In a pure inductor, current lags voltage by \( 90^\circ \) or \( \pi/2 \) radians.
  • In a pure capacitor, current leads voltage by \( 90^\circ \) or \( \pi/2 \) radians.
3

Series LCR Circuit and Resonance

  • In a series LCR circuit, impedance \( Z = \sqrt{R^2 + (X_L - X_C)^2} \).
  • Current \( I_{\text{rms}} = \frac{V_{\text{rms}}}{Z} \).
  • Phase angle \( \phi \) is given by \( \tan\phi = \frac{X_L - X_C}{R} \).
4

Power in AC Circuits and Transformers

  • Average power \( P_{\text{av}} = V_{\text{rms}} I_{\text{rms}} \cos\phi \).
  • Power factor \( \cos\phi = \frac{R}{Z} \), ranges from 0 to 1.
  • In pure resistor, power factor = 1; in pure L or C, power factor = 0.

Key Concepts

Central concept: Alternating Currents

AC Voltage and CurrentPhasor RepresentationAC through ResistorAC through CapacitorAC through InductorSeries LCR CircuitPower in AC CircuitsLC Oscillations

Frequently Asked Questions

What are the important topics in Alternating Currents for Telangana Open School (TOSS) Class 12 Physics?
Alternating Currents covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Alternating Currents — Telangana Open School (TOSS) Class 12 Physics?
Understand the core concepts first, then work through the 51 practice questions available for this chapter. Revise formulas and 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.

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