Current Electricity – Physics 2026 (Boards + JEE + NEET)

Current Electricity is one of the most important and scoring chapters in Physics. It forms the base for Moving Charges & Magnetism, EMI, and Modern Physics.

At CHEMASH, we teach this chapter with strong conceptual clarity, derivations, circuit solving techniques and exam-level numericals for Class 10–12, JEE & NEET 2026.

Electric Current & Drift Velocity
Ohm’s Law & Derivation
Resistance & Resistivity
Series & Parallel Combination
Kirchhoff’s Laws
Wheatstone Bridge
Electric Power & Heating Effect
Solved Numericals
MCQs
FAQs

1️⃣ Electric Current & Drift Velocity

Electric current is the rate of flow of charge.

I = Q / t

Microscopically, current is due to drift velocity of electrons.

I = n e A v_d

n = number density of electrons
e = charge of electron
A = cross-sectional area
v_d = drift velocity

2️⃣ Ohm’s Law

At constant temperature:

V = IR

The V–I graph is a straight line for ohmic conductors.

Unit of Resistance = Ohm (Ω)

3️⃣ Resistance & Resistivity

R = ρL / A

Resistivity (ρ) depends only on material and temperature.

Unit = Ωm

4️⃣ Combination of Resistors

Series:

R = R₁ + R₂ + R₃

Parallel:

1/R = 1/R₁ + 1/R₂ + 1/R₃

5️⃣ Kirchhoff’s Laws

Junction Rule: ΣI = 0

Loop Rule: ΣV = 0

Extremely important for JEE circuit numericals.

6️⃣ Wheatstone Bridge

At balance condition:

P/Q = R/S

Used to measure unknown resistance.

7️⃣ Electric Power & Heating Effect

P = VI = I²R = V²/R

Heat produced: H = I²Rt

8️⃣ Solved Numerical

Q: Two resistors 4Ω and 6Ω in series connected to 10V battery. Find current.

R = 4 + 6 = 10Ω I = V/R = 10/10 = 1A

9️⃣ MCQs (Boards + JEE + NEET)

1. Unit of resistivity:
A) Ω ✔
B) Ωm ✔ (Correct)
C) Ampere
D) Volt

2. In parallel combination, equivalent resistance is:
A) Greater than largest
B) Smaller than smallest ✔
C) Equal
D) Infinite

FAQs

Is Current Electricity important for JEE 2026?
Yes, especially circuit analysis and Wheatstone Bridge.

Does CHEMASH teach advanced circuit solving?
Yes. We focus on step-by-step circuit solving for exams.

Why Study with CHEMASH?

Low-budget tuition for all classes
Experienced and supportive teachers
Strong circuit problem-solving practice
Weekly tests & mock exams
Trusted by students & parents

Work Energy & Power
Laws of Motion

Current Electricity – Physics Classroom

Current Electricity