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Electricity

Class 10 Science • Electricity

Chapter Overview

This chapter explains electric current, potential difference, electric circuits, Ohm's law, resistance, resistivity, combinations of resistors, heating effect of electric current, electric power and electrical energy.

The chapter is especially important for numerical problem solving because several formulas are directly used to calculate current, voltage, resistance, power, energy and equivalent resistance.

📘 Complete Notes

Detailed notes on current, potential difference, Ohm's law, resistance, resistivity, heating effect, power and electrical energy.

❓ Important Questions

Conceptual, reasoning, diagram-based, application-based and exam-oriented questions.

📝 Previous Year Questions

Chapter-focused previous year questions and examination practice resources.

🔢 Numericals

Ohm's law, resistance, series-parallel circuits, power, energy and heating-effect numericals.

Topics Covered

Electric Charge
Electric Current
Electric Circuit
Potential Difference
Voltmeter
Ammeter
Ohm's Law
Resistance
Factors Affecting Resistance
Resistivity
Resistance in Series
Resistance in Parallel
Heating Effect of Electric Current
Joule's Law of Heating
Electric Power
Electrical Energy
Kilowatt-hour
Household Electrical Circuits
Fuse
Overloading
Short Circuit

Quick Revision

Important Formulae

I = Q/t
Electric current
V = W/Q
Potential difference
V = IR
Ohm's law
R = ρl/A
Resistance of a conductor
Rₛ = R₁ + R₂ + R₃ + ...
Series combination
1/Rₚ = 1/R₁ + 1/R₂ + 1/R₃ + ...
Parallel combination
H = I²Rt
Joule's law of heating
P = VI = I²R = V²/R
Electric power
E = Pt
Electrical energy

Series and Parallel Combination

Feature Series Parallel
Current Same through each resistor Divides among branches
Potential Difference Divides Same across branches
Equivalent Resistance Greater than each individual resistance Less than the smallest individual resistance
Common Use Used where same current is required Used in household circuits

Official Study Sources

Use NCERT and CBSE Academic resources for curriculum-aligned study.

NCERT Official Website → CBSE Academic Website →