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Formula Sheet

Current Electricity — Formula Sheet

JEE Mains · Physics

Free Current Electricity formula sheet for JEE Mains Physics 2026 — all important formulas, equations, and constants for quick reference.

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A diagram illustrating Kirchhoff's Junction Rule, showing multiple currents entering and leaving a junction point, emphasizing the conservation of charge.
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Formula Sheet — Current Electricity

Important formulas and equations from Current Electricity for JEE Mains Physics.

Formulas — Current Electricity

Electric Current and Drift Velocity

I = dq/dt ; I_avg = q/t
v_d = eEτ/m
i = neAv_d
j = i/A = nev_d
i = qf (circular orbit)

Resistance, Resistivity and Temperature Dependence

R = ρl/A
R_new = n²R_old (wire stretched n times)
σ = 1/ρ
R(T) = R₀[1 + α(T − T₀)]
ρ(T) = ρ₀[1 + α(T − T₀)]

Ohm's Law, EMF and Terminal Voltage

V = iR
E = W/q
V = E − ir (discharging) ; V = E + ir (charging)
i = E/(R+r)

Kirchhoff's Laws and Circuit Analysis

ΣI = 0 (at junction) — KCL
ΣV = 0 (in closed loop) — KVL
R_series = R₁ + R₂ + ⋯ + Rₙ
1/R_parallel = 1/R₁ + 1/R₂ + ⋯ + 1/Rₙ
Current divider: i₁/i₂ = R₂/R₁ (parallel)

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Frequently Asked Questions

What topics are covered in Current Electricity for JEE Mains?
Current Electricity is an important chapter in JEE Mains Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Electric Current and Drift Velocity, Resistance and Resistivity, Ohm's Law and V-I Characteristics, Combination of Resistors.
How important is Current Electricity for JEE Mains?
Current Electricity is a frequently tested chapter in JEE Mains Physics. Questions from this chapter appear regularly in previous year papers. There are 113 practice questions available for this chapter.
How to prepare Current Electricity for JEE Mains?
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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