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Formula Sheet

Alternating Current — Formula Sheet

WBJEE · Physics

Free Alternating Current formula sheet for WBJEE 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 WBJEE 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 WBJEE?
Alternating Current is an important chapter in WBJEE 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 WBJEE?
Alternating Current is a frequently tested chapter in WBJEE 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 WBJEE?
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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