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Electric current for class 10, Summaries of Physics

Physics

This is a quick summary fro electric current

Typology: Summaries

2025/2026

Available from 06/10/2026

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CURRENT ELECTRICITY
Professional Study Notes for Class 12 Physics
Chapter Overview
This chapter covers electric current, drift velocity, Ohm's law, resistance, resistivity, electrical
energy, power, EMF, internal resistance, and Kirchhoff's laws.
1. Electric Current
Current is the rate of flow of charge. Formula: I = Q/t
2. Drift Velocity
I = nAevd. Drift velocity is the average velocity of electrons in a conductor under an electric field.
3. Ohm's Law
V = IR. At constant temperature, current is directly proportional to voltage.
4. Resistance and Resistivity
R = ρL/A. Resistance depends on length, area, material, and temperature.
5. Combination of Resistors
Series: Req = R1 + R2 + ...
Parallel: 1/Req = 1/R1 + 1/R2 + ...
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CURRENT ELECTRICITY

Professional Study Notes for Class 12 Physics

Chapter Overview

This chapter covers electric current, drift velocity, Ohm's law, resistance, resistivity, electrical energy, power, EMF, internal resistance, and Kirchhoff's laws.

1. Electric Current

Current is the rate of flow of charge. Formula: I = Q/t

2. Drift Velocity

I = nAevd. Drift velocity is the average velocity of electrons in a conductor under an electric field.

3. Ohm's Law

V = IR. At constant temperature, current is directly proportional to voltage.

4. Resistance and Resistivity

R = ρL/A. Resistance depends on length, area, material, and temperature.

5. Combination of Resistors

Series: Req = R1 + R2 + ...

Parallel: 1/Req = 1/R1 + 1/R2 + ...

Important Formulas

I = Q/t V = IR R = ρL/A I = nAevd P = VI P = I²R P = V²/R W = VIt E = V + Ir V = E − Ir

Board Exam Tips

Focus on derivations of drift velocity, resistivity, series/parallel combinations, and numerical problems involving power and internal resistance.

Practice Questions

  1. Define electric current and derive I = Q/t.
  2. State and explain Ohm's Law.
  3. Derive the equivalent resistance of resistors in series.
  4. Explain EMF and internal resistance.