PhysicsScalar QuantityNCTB পদার্থবিজ্ঞান অধ্যায় ১১ (চল তড়িৎ)
Electrical Resistance
Bengali: বৈদ্যুতিক রোধ•Pronunciation: রেজিস্ট্যান্স•Symbol: R
Standard Definition:
The measure of opposition to the flow of electric current through an electrical conductor.
📐 Mathematical Equation, Units & Dimensions
Defining Mathematical Equation
Standard SI Unit
Ohm (\Omega)($\Omega$ (ওহম))
Dimensional Analysis
CGS Unit
stat\Omega
📖 Physical Concept & Comprehensive Explanation
Electrical resistance arises as conducting electrons collide with lattice ions. By Ohm's law, R = V/I. Resistance scales directly with wire length and inversely with cross-sectional area as R = rho * L / A.
💡
Quick Memory Hook:V = I * R (Voltage = Current * Resistance)
🎯 High-Yield Revision Points
- ✓Ohm's Law: V = IR or R = V/I.
- ✓Resistance geometry formula: R = rho * L / A.
- ✓Resistance of metallic conductors increases with rising temperature.
Use Online Solver for Electrical Resistance
Compute step-by-step solutions, verify formulas, and plot interactive diagrams on biggan.me.
❓ Frequently Asked Exam Questions (FAQ)
Common questions in board and competitive entrance examinations
Q1: Define 1 Ohm of resistance.
One Ohm is the resistance between two points when 1 Volt potential difference produces 1 Ampere current.