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Current Electricity — Revision Notes

IISER Aptitude Test · Physics

Free Current Electricity revision notes for IISER Aptitude Test Physics 2026 — key concepts, formulas, and definitions for quick revision.

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Revision Notes — Current Electricity

Key concepts, formulas, and definitions from Current Electricity for IISER Aptitude Test Physics preparation.

Key Topics to Revise

1

Electric Current and Current Density

  • Electric current is the rate of flow of electric charge through a conductor
  • Current flows from positive to negative terminal (conventional current direction)
  • Current density represents current per unit area and is a vector quantity
2

Ohm's Law and Resistance

  • Ohm's law states that current is directly proportional to potential difference
  • Resistance depends on material properties and dimensions of conductor
  • Resistivity is material property independent of dimensions
3

Drift Velocity and Microscopic Origin

  • Drift velocity is average velocity of electrons in presence of electric field
  • Relaxation time is average time between collisions
  • Mobility relates drift velocity to applied electric field
4

Temperature Dependence of Resistivity

  • Resistivity of metals increases linearly with temperature
  • Semiconductors show exponential decrease in resistivity with temperature
  • Alloys have weak temperature dependence

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Key Concepts

Electric current is defined asOhm's law states that the potentialDrift velocity (vd) is the averageFor metalsElectrical power P = VI =

Frequently Asked Questions

What topics are covered in Current Electricity for IISER Aptitude Test?
Current Electricity is an important chapter in IISER Aptitude Test Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Electric Current and Current Density, Ohm's Law and Resistance, Drift Velocity and Microscopic Origin, Temperature Dependence of Resistivity.
How important is Current Electricity for IISER Aptitude Test?
Current Electricity is a frequently tested chapter in IISER Aptitude Test Physics. Questions from this chapter appear regularly in previous year papers. There are 507 practice questions available for this chapter.
How to prepare Current Electricity for IISER Aptitude Test?
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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