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Formula Sheet

Alternating Current — Formula Sheet

J&K CET · Physics

Free Alternating Current formula sheet for J&K CET Physics 2026 — all important formulas, equations, and constants for quick reference.

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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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Formula Sheet — Alternating Current

Important formulas and equations from Alternating Current for J&K CET Physics.

Formulas — Alternating Current

AC Fundamentals

I = I_m sin ωt
I_rms = I_m / √2 = 0.707 I_m
I_avg = 2I_m / π = 0.637 I_m
ω = 2πν = 2π/T

AC in Resistor, Inductor, Capacitor

X_L = ωL = 2πνL
X_C = 1/(ωC) = 1/(2πνC)
V_L = I × X_L
V_C = I × X_C

LCR Series Circuit and Resonance

Z = √[R² + (X_L - X_C)²]
tan φ = (X_L - X_C)/R
I_m = V_m/Z
ω₀ = 1/√(LC)
Q = ω₀L/R = 1/(ω₀CR)

AC Power and Power Factor

P = V_rms × I_rms × cos φ
P = I²_rms × R
cos φ = R/Z
P = V²_rms/Z × cos φ

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Frequently Asked Questions

What topics are covered in Alternating Current for J&K CET?
Alternating Current is an important chapter in J&K 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 J&K CET?
Alternating Current is a frequently tested chapter in J&K 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 J&K 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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